Whenever Atemsis deals damage to an opponent, you may reveal your hand. If cards with at least six different mana values are revealed this way, that player loses the game.
Atemsis is a mono-blue value engine that loots to dig for answers and threats, then wins out of nowhere by connecting for combat damage while holding a hand of cards with six different mana values. Spend the early game ramping, drawing, and protecting yourself, then untap with Atemsis, sculpt your hand to exactly six distinct mana values, push it through for one swing, and reveal for the instant kill.
Singleton mono-blue means easy access to the best counterspells, card draw, and tutors to assemble the exact hand and protect the swing.
An alternate, hand-reveal win that bypasses life totals and ignores how much defense an opponent has.
Built-in card advantage via the loot ability keeps your hand stocked and lets you sculpt mana-value diversity.
Cheap, repeatable game-ending threat that doubles as a fine draw engine if the kill isn't online yet.
The win requires Atemsis to connect in combat, so unblockable/evasion enablers are mandatory and removal is devastating.
Mono-blue struggles with permanent-based problems—enchantments and artifacts are hard to remove.
Needs you to hold a specific hand of six different mana values, which fights against actually casting your spells.
Opponents who simply chump-block, gain life irrelevance aside, or kill Atemsis in response shut the plan down.