Steel of the Godhead
0d3c9145-14d0-4731-bc07-eb4c3f71d7e4
$1.97 CND
Enchant creature
As long as enchanted creature is white, it gets +1/+1 and has lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)
As long as enchanted creature is blue, it gets +1/+1 and can't be blocked.