Whenever another creature you control enters, put X +1/+1 counters on it, where X is this creature's power.

Flying
Amity — Whenever you attack with Earthbreaker Dragon and exactly one other creature, Earthbreaker Dragon deals 1 damage to each of up to two target creatures without flying.

When this creature enters, mill two cards, then you may cache a permanent card from your graveyard.

Solidarity
Edgeland Battlefury must be blocked if able, and it must be blocked by two or more creatures if able.

Edgeland Market enters tapped unless you control a basic non-Mountain land.
{T}: Add {R}.
{2}{R}, {T}: Create a 0/1 white Goat creature token.

Create a Solidarity token. When you do, pay for and choose any number.
+{R} — Edgeland Pledge deals 2 damage to any target.
+{U} — Tap up to three target creatures.
+{G} — Create a 1/1 red Soldier creature token. It gains haste until end of turn.

Landfall — Whenever a land you control enters, Eerie Sculpture deals 1 damage to target player or planeswalker.

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.

This land enters tapped.
{2}{U}{B}, {T}: Surveil 1.

When Eidolon of Empty Thoughts dies, create a Treasure token.
{6}: Create a 2/1 red Soldier creature token. Activate only as a sorcery and only if your devotion to red is three or more.

When Elderflame Pilgrims enters, it deals 2 damage to target player or planeswalker.
Wander {5}{R}

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.

Choose one —
• Elektes's Charge deals 2 damage to each nonenchantment creature.
• Up to two target creatures you control each get +2/+0 and gain trample until end of turn.

Vigilance
{T}, Sacrifice an artifact or enchantment: Add {R}{G}.

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

Vigilance
At the beginning of combat on your turn, if you've spent at least five mana to cast spells this turn, put a +1/+1 counter on Encampment Sentinel.

Whenever equipped creature dies, put two soul counters on this Equipment and draw a card.
Equipped creature gets +1/+1 for each soul counter on this Equipment.
Equip {2}

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.

When Endangered Scinok dies, put a +1/+1 counter on up to one target creature.

As this land enters, you may pay 2 life. If you don't, it enters tapped.
{T}: Add {U} or {B}.

Enspirited Ore gets +1/+1 for each other artifact you control.
Tap three untapped artifacts you control: Enspirited Ore gains indestructible until end of turn.

{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.

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.

Enchant land
Enchanted land has “{T}: Add {G}{G}.”

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