Sneak is the dominant mechanic in TMT by a wide margin, fifty-nine cards deep, and that single fact is what elevates this from a clean answer into one of the better blue commons in the format. A resolved Sneak creature on the other side of the table is the tempo crisis the set keeps manufacturing: bodies arrive mid-combat with abilities attached and threaten to leave you down a card and a chunk of life. You can't catch the trigger itself, since the creature isn't a legal target until it's on the battlefield, but flash lets you act once it resolves and before attackers are declared, pinning it to a 0/1 with no abilities and no attack step for the rest of the game. Grounded for Life punishes a tapped attacker more cheaply, but it has to wait for the swing; this card forecloses the swing entirely.
UR Sneak and GU tempo want it most, and the pick band sits around P1P4 to P1P6 in any blue deck. It's a maindeck card everywhere blue except a deeply controlling build that already leans on Dimensional Exile and prefers exile-based permanent answers. The cost the rate doesn't advertise is enchantment fragility: any bounce returns the enchanted creature to its owner's hand at full strength, and your three mana evaporates. The creature also stays the opponent's, so you've neutralized a body, not claimed one. Against Shredder, Unrelenting or the mythic Turtle legends, that exposure is the price of admission; against a vanilla 2/3 common, you're paying three mana for parity.
Three mana is the ceiling here. At four it would be too slow to answer the Sneak triggers it exists to punish, and the rate would collapse.
