Cockadoodledoo (AC18-EN014) [Advent Calendar 2018]

If there are no monsters on the field, you can Special Summon this card (from your hand) as a Level 3 monster. If your opponent controls a monster and you control no cards, you can Special Summon this card (from your hand) as a Level 4 monster. If this face-up card would leave the field, banish it instead.