Endgame
{T}: Add {B} or {G}.
{T}, Sacrifice Evelyn Snakewood: Return target creature card from your graveyard to the battlefield tapped. Activate only if you're in your endgame.

Exile target nonland permanent if its mana value is less than or equal to the greatest number of nonland permanents controlled by a single player.

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

When Everpresent Rot enters, create a 1/1 green Saproling creature token, surveil 1, then you gain 1 life.
When one or more permanent cards leave your graveyard, return Everpresent Rot to its owner's hand.

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.

Endgame
{3}, Sacrifice Execution Table: It deals 3 damage to target creature. If you're in your endgame, it deals 5 damage instead.

{T}, Waste a nonwastes land you control: Add one mana of any color.

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.

Trample, haste
Decayed

Vanguard — Whenever a creature you control attacks alone, you may put a charge counter on Expert Belt and attach it to that creature.
Equipped creature has hexproof.
Equipped creature gets +1/+0 for each charge counter on Expert Belt.
Equip {2}

You may play an additional land this turn.
Draw a card.

{3}, {T}, Sacrifice Explosive Canister: Explosive Canister deals 3 damage to any target.

Each opponent loses X life. You gain life equal to the life lost this way.

Flash
Enchant creature
When Face It All enters, prevent all damage that would be dealt to enchanted creature this turn.
Enchanted creature gets +1/+1.

Exile the top two cards of your library. You may play those cards until you next cast a spell from your hand.
Flashback {3}{R}{R}

Target creature gets -3/-2 until end of turn.

Cards in graveyards can't leave the graveyard.
Cycling {2}

Deathtouch, lifelink

As an additional cost to cast this spell, sacrifice a creature.
Fall Upon Your Blade deals damage equal to the sacrificed creature's power to any target.
Cycling {2}

Whenever a creature you control attacks alone, you may pay {1}{B}. If you do, return this card from your graveyard to the battlefield tapped and attacking.

As an additional cost to cast this spell, return a creature you control to its owner's hand.
Counter target spell.

Creatures can't attack you or a planeswalker you control unless their controller pays {1} for each of those creatures beyond the first.

Up to one target creature gets -2/-2 until end of turn. Create a 1/1 black Horror creature token.
Coalesce {6}{B}

Destroy target creature whose power, toughness, and mana value aren't all equal.

Target player mills two cards, then mills two more cards for each card named Fathomless Dominion in your graveyard.