Syr Reale, the Mind Warper

Whenever a creature you don't control dies, you
may pay {u}{b}. If you do, create a 2/3 blue and
black Spirit Knight creature token.
{1}{u}{b}, {t}: Target opponent puts the top X
cards of their library into their graveyard, where
X equals the number of Spirits you control.
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"This 'is' reality. Or is it? "