Herald of Serra

Flying, vigilance
Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)

Mirri, Cat Warrior

First strike, forestwalk, vigilance (This creature deals combat damage before creatures without first strike, it can’t be blocked as long as defending player controls a Forest, and attacking doesn’t cause this creature to tap.)

Rabid Wombat

Vigilance
Rabid Wombat gets +2/+2 for each Aura attached to it.

Iron-Heart Chimera

Vigilance
Sacrifice Iron-Heart Chimera: Put a +2/+2 counter on target Chimera creature. It gains vigilance. (This effect lasts indefinitely.)

Ghost Hounds

Vigilance
Whenever Ghost Hounds blocks or becomes blocked by a white creature, Ghost Hounds gains first strike until end of turn.

Rabid Wombat

Vigilance
Rabid Wombat gets +2/+2 for each Aura attached to it.