Elusive Tormentor // Insidious Mist

Hexproof, indestructible
This creature can't block and can't be blocked.
Whenever this creature attacks and isn't blocked, you may pay {2}{B}. If you do, transform it.

Older vampires are usually more cautious than the newly-sired, calling upon ancient magic for which neonates lack patience.

{1}, Discard a card: Transform this creature.

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{1}, Discard a card: Transform Elusive Tormentor.

Once blockers have been chosen, transforming Elusive Tormentor into Insidious Mist won't cause it to become unblocked.

You can activate Elusive Tormentor's ability multiple times to discard multiple cards. Only the first instance of the ability to resolve will cause it to transform.

You can, all within one turn, attack with Elusive Tormentor, transform it into Insidious Mist before blockers are chosen, transform it back as its triggered ability resolves, and have it deal 4 combat damage.