Flying, protection from Wizards and enchantments.

{2}{S}: Exile a card from your hand face down. You may look at and cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell.

Whenever Gustha deals combat damage to a player, exile a card at random from your hand. You may cast that card without paying its mana cost until end of turn.