Kill Switch

Target creature can't be blocked this turn.

X, T: Target creature gets -X/+X until end of turn.

Each player loses 1 life for each creature they control.

Until end of turn, target land becomes a 3/3 creature that's still a land.

At the beginning of each opponent's upkeep, this creature deals X damage to that player, where X is the number of cards in their hand minus 4.

This creature can't block or be blocked by creatures with power 2 or greater.

T: Add C. 1W, T: Prevent all combat damage that would be dealt by target attacking creature this turn.

Cast this spell only during the declare blockers step. Attacking creatures become blocked. (This spell works on creatures that can't be blocked.)