mtg revolt cards Baral's Expertise [Aether Revolt] for illustration purposes only Call for Unity [Aether Revolt]

Mark Rosewater has explained that they exist to balance the metagame and to encourage players to play multicolor decks

As a sorcery, you may pay the mana cost of a locked door to unlock it.) To cast a Room spell, choose a half (or "door") to cast

Then the player whose turn it is selects a card from his or her hand and sets it aside without revealing it

If you prefer to entice opponents into doing your bidding, cards like Intellectual Offering will be your go-tos

Some of the cards revealed are legendary creatures released in Magic: The Gathering that have been given a Spider-Man makeover

Voracious Hydra Having an immediate effect when entering the battlefield is a good way to be playable in Constructed, and Voracious Hydra has it