Lockdown

: The next time you would draw a card this turn, each player returns a permanent they control to its owner's hand instead.

Whenever an opponent discards a card, you may draw a card.

When this creature enters, destroy target creature with power 4 or greater. It can't be regenerated. Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Whenever a permanent is returned to a player's hand, that player discards a card.