Demon Core

Indestructible.
This creature can’t attack, block or be sacrificed.
When the Demon Core enters it gets 1 Doom counter.
On the beginning of your upkeep double the amount of
Doom counters on the Demon Core.
On the beginning of your end step you get X rad counters where X is the number of Doom counters on the Demon Core.
Pay 4 to roll a D20: 1-15 you pass the Demon Core to the next player. If you roll a 16-19 you drop the Demon Core
and double the amount of Doom counters on the Demon Core If you ro