Reverse Bear Trap

Indestructible.

The player is trapped.

At the beginning of a trapped player's first main phase, they may pay 2 life. If they do, they reveal the top card of the trap deck and skip to combat. At the beginning of the player's end step, add 1 trap counter, then if:

4 trap counters — player loses half their life and half their deck, rounded down.
6 trap counters — player loses the game.