Haste
Whenever you cast a spell that targets Efimia of the Horse, create a 1/1 white Human creature token if this is the first time this ability has resolved this turn. If it's the second time, creatures you control get +1/+0 and gain haste until end of turn. If it's the third time, creatures you control gain menace until end of turn.

When Elder Soulblade enters, search your library and/or graveyard for a creature card with mana value 2 or less. Put that card onto the battlefield, attach Elder Soulblade to it. If you searched you library this way, shuffle.
Equipped creature gets +3/+1 and has menace.
Equip {5}

Vigilance
Flow — {4}{W}: Exile target permanent card with mana value 3 or less from your graveyard. Create a tapped token that's a copy of it. Activate only as a sorcery.

First strike, lifelink
When this creature transforms into Eleanor, Kingslayer, exile up to one target creature. If that creature was legendary, put two +1/+1 counters on Eleanor.

Flash
When Eleanor, Royal Captain enters, target legendary creature gains indestructible until end of turn.
Cybersoul {5}{W/B}

Corrupt — Electronic Countermeasures deals 5 damage to target creature or planeswalker. If you control a permanent with greater mana value than this spell, exile the top X cards of your library, where X is the excess damage dealt this way. You may play those cards until your next end step.

Legendary permanents you control have “{1}, {T}: Tap target creature.”
At the beginning of each end step, scry 1 if you spent {U} to activate abilities this turn, Ema deals 1 damage to each opponent if you spent {R}, and put a +1/+1 counter on a creature you control if you spent {W}.

{1}, Exile a permanent card from your graveyard: Surveil 2.
{2}, Exile two permanent cards from your graveyard: Draw a card.
{5}, Exile five permanent cards from your graveyard: Exchange your hand and graveyard.

Exile the top four cards of your library. You may play them until you play a card not exiled this way.

Lifelink
Whenever Empowered Revisionary attacks, if its power is greater than its base power, create a number of 1/1 colorless Soldier creature tokens equal to the difference.

This spell can't be countered.
First strike, haste
Whenever an opponent casts a spell during your turn, End of Mutations deals 5 damage to them.

{G}, Sacrifice Entangled Fossil: Target card in your graveyard gains surface until end of turn. The surface cost is equal to its mana cost.
Surface {4}{G}{G}. Entangled Fossil surfaces transformed.

Choose one. If your devotion to white is three or greater, you may choose another. The same is true for devotion to blue.
• Counter target spell.
• Target player draws a card.
• Target player gains 4 life.

Ephemeral Mire enters tapped.
{T}: Add {U} or {B}.
{4}{U/B}: Until end of turn, Ephemeral Mire becomes a 3/2 black and blue Horror creature until end of turn and can't be blocked this turn. It's still a land. This ability costs {X} less to activate, where X is your devotion to black and blue. Activate only once each turn.

At the beginning of each combat, until end of turn, creatures you control have base power equal to the greatest base power among creatures you control and have base toughness equal to the greatest base toughness among creatures you control.

If you would create one or more tokens, you may instead create that many tokens that are copies of a token you control. Do this only once each turn.
Whenever you attack, you may create a 1/1 blue Bird creature token with flying.

This land enters tapped unless you control one or fewer other lands.
{T}: Add {B} or {R}.
Cycling {2}

Reach, trample
Fabric — At the beginning of combat on your turn, target creature gets +X/+X and gains trample until end of turn, where X is the number of enchantments you control.

{1}{R}: Erupting Volcamel and up to one other target creature you control get +2/+0 until end of turn.
Whenever you activate a nonmana ability, if you've spent at least six mana to activate nonmana abilities this turn, Erupting Volcamel deals 2 damage to any target.

{T}: Add {C}.
{2}, {T}: For each color among permanents you control, add one mana of that color.

Enchant creature with another Aura attached to it
Enchanted creature gets +3/+3 and has trample, vigilance, and reach.

This spell can't be countered.
Whenever Eviviva enters or attacks, create a 2/2 red Warrior creature token with “Whenever this creature deals combat damage to a player, exile the top card of your library. You may play that card this turn.”

Deathtouch
Other Gorgons, Snakes, and Basilisks you control get +1/+1.
Whenever a creature with deathtouch you control deals combat damage to a player or planeswalker, create a Treasure token.

When Exemplar of Grit dies while attacking, return it to the battlefield tapped under its owner's control with a defender counter on it.
When Exemplar of Grit dies while blocking, return it to the battlefield tapped under its owner's control with a decayed counter on it.

When this creature enters, target player separates their hand into a face-up pile and a face-down pile. Choose one of those piles, reveal it, and choose a nonland card from it. Exile that card until this creature leaves the battlefield.