Armored Bee

Flying
Whenever one or more creatures with Flying, or
Insects, deals combat damage to an opponent,
defending player may pay {p/c}{p/c}. If they do not,
they must put two -1/-1 counters on up to two
creatures they control.
Whenever a creature would die with -1/-1 counters
on it, you may pay {2}, and if you do, put a shield
counter on Armored Bee.