Poliwag

Weakness to grass
Islandwalk
When Poliwag becomes the target of a spell or
ability you may discard a card. If you do it gains
+0/+3 and hexproof until the end of the turn.
Despite the danger, it wants to come up on land. So it
does its best to waddle along, but when an enemy finds
it, it rushes back to the water.