Instant Protection (CTRL to add secondary) Pump Pump (CTRL to add secondary) Ramp Ramp (CTRL to add secondary) Removal Chainweb Aracnir Reach When this creature enters, it deals damage equal to its power to target creature with flying an opponent controls
The more Morph creatures you have, the betters your others get, because the variability of what that creature might become is much higher, making decisions more difficult for your opponent
This one is especially potent, because with two you can loop them back and forth: using one to return the other
Thirst for Knowledge
Also, these types of cards (usually) let you remove other permanent types besides creatures as well
Create a 2/2 green Bird creature token with "Whenever a land you control enters, this token gets +1/+0 until end of turn." If the target is illegal when Choco-Comet tries to resolve, it won't resolve and none of its effects will happen