Witch's Switch

Choose a spell and then put the top four cards of your library into your graveyard. Counter that spell unless that spell's controller pays X, where
X is the total converted mana cost of those cards.
Delirium -- If there are four or more card types among cards in your graveyard, create X 1/1 black and green Frog creature tokens, where X is the number of card types in your graveyard.
"I didn't like that spell. But I like frogs!"