Stasis Snare

Flash is the modification that matters. The long line of exile enchantments this descends from, Oblivion Ring and its cousins, always shared the same liability: a sorcery-speed answer means tapping out and hoping the threat has already resolved, then committing your turn with no way to interact with what comes next. Moving the exile onto an enchantment you can hold up collapses that gap, letting the removal live in the same window as a counterspell and respond to whatever an opponent commits. The vulnerability is narrower than it looks but real. The exile rides a triggered ability that goes on the stack when the enchantment enters, so an opponent holding instant-speed enchantment removal can destroy or bounce it in response; the trigger still resolves, but with the enchantment already gone, the "until this enchantment leaves the battlefield" duration has expired, so the exile lasts no time at all and the creature never leaves. The other cost is the permanent it leaves behind. Any disenchant effect can strip the enchantment and return the exiled creature, which makes the exile a loan rather than a sale, conditional on nobody packing artifact-and-enchantment hate. That conditional permanence is the genuine tension. White's clean instant-speed creature removal has always been scarce by color-pie convention, and exile-on-an-enchantment with flash is one of the more durable ways to bend that constraint without breaking it: it patrols both the proactive and reactive lanes from a single card, provided the answer survives the response it invites.