At the beginning of combat on your turn, target creature you control gets +2/+0 until end of turn. At the end of combat on your turn, if a player was dealt 6 or more combat damage this turn, transform this enchantment, then attach it to a creature you control.

Double Overdrive — Equipped creature gets +2/+0 and has double strike (This creature deals both first-strike and regular combat damage.). Equip (: Attach to target creature you control. Equip only as a sorcery. This card enters unattached and stays on the battlefield if the creature leaves.)