Sundering Blade

Equip {p/c}
If you paid {p/c} with Mana, Equipped creature gains +2/+0 and First Strike.
If you paid {p/c} with life, Equipped creature gains +2/+0 and Lifelink.
"It seems to me that the Ancients paid a rather unpleasant cost to establish their dominance"
-Senior Mage Yoon, Expedition Logbook.