Jreemar, Heir to Rage

Rage (This creature costs twice as much mana to cast (including colored mana), has twice as much power (rounded down), and has twice as much toughness (rounded down.)
When Jreemar's toughness is higher than its
power, sacrifice Jreemar, Heir to Rage
At the beginning of your upkeep, you may
sacrifice a creature you control. If you do,
Jreemar gets +2/+0 until end of turn.