Eyes of the Wisent
{1}{G}
Kindred Enchantment -- Elemental
Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token.
Witchstalker
{1}{G}{G}
Creature -- Wolf
3/3
Hexproof (~this~ can't be the target of spells or abilities your opponents control.)
Whenever an opponent casts a blue or black spell during your turn, put a +1/+1 counter on ~this~.