Samuel, Guardian Mage

Hexproof
When Samuel, Guardian Mage enters the battlefield, all humans gain +0/2

{w}{5}{t} (This ability has flash and can be used outside of your turn) If an opponent's attacking creature has double strike, trample, goad, or first strike, remove all of those keywords from that creature.
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{u}{u}{w} If an opponent has more life than you, deal 5 damage to them. (This cannot be countered)