Flash (You may cast this spell any time you could cast an instant.)
When Capture Sphere enters the battlefield, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.
Chamber Sentry enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.
, , Remove X +1/+1 counters from Chamber Sentry: It deals X damage to any target.
: Return Chamber Sentry from your graveyard to your hand.
At the beginning of your upkeep, exile a creature card from your graveyard. If you do, put a +1/+1 counter on Charnel Troll. Otherwise, sacrifice it.
, Discard a creature card: Put a +1/+1 counter on Charnel Troll.