Lead-Belly Chimera

Trample
Sacrifice this creature: Put a +2/+2 counter on target Chimera creature. It gains trample. (This effect lasts indefinitely.)

Brass-Talon Chimera

First strike
Sacrifice this creature: Put a +2/+2 counter on target Chimera creature. It gains first strike. (This effect lasts indefinitely.)

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

Flying
Sacrifice this creature: Put a +2/+2 counter on target Chimera creature. It gains flying. (This effect lasts indefinitely.)

Mistform Ultimus is every creature type (even if this card isn't on the battlefield).