Corpsejack Menace

If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on it instead.

Tajuru Beastmaster

Rally — Whenever this creature or another Ally you control enters, creatures you control get +1/+1 until end of turn.

Nimana Sell-Sword

Whenever this creature or another Ally you control enters, you may put a +1/+1 counter on this creature.

Graypelt Hunter

Trample
Whenever this creature or another Ally you control enters, you may put a +1/+1 counter on this creature.

Joraga Bard

Whenever this creature or another Ally you control enters, you may have Ally creatures you control gain vigilance until end of turn.

Tajuru Pathwarden

Vigilance (Attacking doesn't cause this creature to tap.)
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Kalastria Healer

Rally — Whenever this creature or another Ally you control enters, each opponent loses 1 life and you gain 1 life.

Bojuka Brigand

This creature can't block.
Whenever this creature or another Ally you control enters, you may put a +1/+1 counter on this creature.

Kalastria Nightwatch

Whenever you gain life, this creature gains flying until end of turn.

Oran-Rief Survivalist

Tajuru Stalwart

Converge — This creature enters with a +1/+1 counter on it for each color of mana spent to cast it.