Elvish Vanguard

Whenever another Elf enters, put a +1/+1 counter on Elvish Vanguard.

Wellwisher

{T}: You gain 1 life for each Elf on the battlefield.

Elvish Mystic

Elvish Herder

{G}: Target creature gains trample until end of turn.

Ulamog's Crusher

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents of their choice.)
Ulamog's Crusher attacks each combat if able.

Priest of Titania

{T}: Add {G} for each Elf on the battlefield.

Taunting Elf

All creatures able to block Taunting Elf do so.

Seeker of Skybreak

Elvish Visionary

When Elvish Visionary enters, draw a card.

Copperhorn Scout

Whenever Copperhorn Scout attacks, untap each other creature you control.

Timberwatch Elf

{T}: Target creature gets +X/+X until end of turn, where X is the number of Elves on the battlefield.

Lifecraft Cavalry

Trample
Revolt — Lifecraft Cavalry enters with two +1/+1 counters on it if a permanent you controlled left the battlefield this turn.

Lys Alana Huntmaster

Whenever you cast an Elf spell, you may create a 1/1 green Elf Warrior creature token.