Flash (You may cast this spell any time you could cast an instant.)Enchant creature (Target a(n) creature as you cast this. This card enters the battlefield attached to that creature.)
Enchanted creature gets +1/+2 and has vigilance (Attacking doesn't cause this creature to tap.).
Addendum — When Sentinel's Mark enters the battlefield, if you cast it during your main phase, enchanted creature gains lifelink (Damage dealt by the creature also causes its controller to gain that much life.) until end of turn.
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