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Whenever a nontoken creature enters the battlefield
under your control roll a D20.
[1-8] That creature gains Haste until end of turn.
[9-19] That creature gains Haste. Create a token
copy of that creature with Haste, sacrifice it at
the beginning of your end step.
[20] Do all of the above then roll again.
Whenever a creature enters your opponents battlefield they must roll a 10 or higher on a D20
or it enters tapped.