Grenzo, Havoc Raiser [Secret Lair Drop Series] Secret Lair Showdown If you reveal a creature

If you reveal a creature card this way

First Miku takes the stage

Exile three cards from your graveyard: Psychic Frog gains flying until end of turn

Then Mjölnir deals damage to each opponent equal to the number of tapped creatures that opponent controls

you may pay {4}

Grenzo, Havoc Raiser [Secret Lair Drop Series] Secret Lair Showdown If you reveal a creatureSet: Secret Lair Drop Series Type: Legendary Creature Goblin Rogue Rarity: Rare Cost: {R}{R} Whenever a creature you control deals combat damage to a player, choose one Goad target creature that player controls. Exile the top card of that player's library. Until end of turn, you may cast that card and you may spend mana as though it were mana of any color to cast that spell.