Advocate of the Beast

At the beginning of your end step, put a +1/+1 counter on target Beast creature you control.

Druid of the Anima

Knotvine Mystic

Axebane Beast

Vagrant Plowbeasts

{1}: Regenerate target creature with power 5 or greater.

Marath, Will of the Wild

Marath, Will of the Wild enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.
{X}, Remove X +1/+1 counters from Marath: Choose one —
• Put X +1/+1 counters on target creature. X can't be 0.
• Marath deals X damage to any target. X can't be 0.
• Create an X/X green Elemental creature token. X can't be 0.