Ovinoherder

Wayfarer {2}{u} ({2}{u}: Exile this creature. Activate this ability only as a sorcery. At the beginning of your next upkeep, return it to the battlefield. It gains haste until end of turn.)
When Ovinoherder enters the battlefield, until your next turn, each creature with converted
mana cost X loses all abilities and becomes a green Sheep with base power and toughness 0/1, where X is the number of cards in your hand.