If you do, untap it and it gets +1/+1 until end of turn

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If you can manipulate the top of your library to make sure that the right creatures are there, you can guarantee the lines of play in your deck will work smoothly
One of those is that this green, white, blue and black 4/4 has Flying, Vigilance, Deathtouch and Lifelink - but its mostly the other ability