Maybe it builds-up to a limit break-style ultimate ability on some creatures
Activate only as a sorcery.) Creature - Wizard Merfolk Evasion (CTRL to add secondary) Land Mosswort Bridge Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.) This land enters tapped
Clive Rosfield deals damage equal to that spells mana value to that player or a planeswalker that player controls
Its not an adventure spell, but Uro is fantastic when your strategy is self-mill
If its your commander, youre very limited in what kind of cards you can have them bouncing and bringing back, and you may have to turn to artifact sources like Urzas Tome or Smugglers Copter to start doing weird things with it like Eldrazi Conscription
A creature can be dealt an amount of damage greater than its toughness