Maelstrom Rift

Whenever a player casts a noncreature spell, flip a coin. If you win the flip, each other player creates a copy of that spell.
Whenever a permanent enters the battlefield, flip a coin. If you win the flip, the owner of that permanent shuffles it into their library. Until end of turn, whenever that player attacks, each other player creates a copy of each attacking creature. They gain haste. Exile them at end of combat.