mtg blue search your library for a card Meletis Astronomer [Born of the Gods] block) closed.class Library of Lat-Nam [Alliances]

Timing Counterplays: A clever move is to end the turn before transitioning to the opponent's turn, leaving mana open to cast instant spells like counterspells

Use this card to flicker something like Agent of Treachery repeatedly with cheap spells, and your opponents boards will be so bare youll have to resort to stealing their lands (or you can do that first depending on how mean you want to be)

Once it's used, it cannot be used again for the rest of the game unless the creature is removed from the battlefield and returned to it

The loop is infinite, and thanks to the word may on this card you can just say they each have 11 million +1/+1 counters to end the madness

While this is already a staggeringly high number, thats not even counting the 1000+ multicolored cards as well

Venat, Heart of Hydaelyn #39 Final Fantasy Change Version Venat, Heart of Hydaelyn Legendary Creature Elder Wizard Whenever you cast a legendary spell, draw a card