Deal Gone Bad

Target creature gets -3/-3 until end of turn. Target player mills three cards. (They put the top three cards of their library into their graveyard.)

Countermand

Counter target spell. Its controller mills four cards.

Target player mills three cards.
Flashback {1}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Lifelink
When Desperate Bloodseeker enters, target player mills two cards. (They put the top two cards of their library into their graveyard.)

Counter target spell. Its controller mills three cards.

Target player mills five cards.
Cycling {U} ({U}, Discard this card: Draw a card.)

Target player discards a card, then mills a card.