The Rhine Blade

Equipped creature gets +5/+1 and gains First
Strike.
When equipped creature deals combat damage,
roll a d20. If you roll X or lower, where X is the
damage you dealt with The Rhine Blade this
turn, tap equipped creature: you may deal
damage to target creature equal to equipped
creature's power. Equipped creature does not
untap during the next untap phase.
Equip {8}{r}