Slag-God Raglurthh

Defender
Mana-Debt: {1}{r}{r} (At any point during this cards' owner's turn, they may activate Mana-Debt, permanently tapping the displayed mana until the creature is destroyed or this ability is deactivated)
Whilst Mana-Debt is active, Raglurthh gains +8/+2, loses Defender, becomes a Red colour and gains Incinerate.