Shadow Nexus

Hive Mind — At the beginning of your upkeep,
you may pay {4}, if you do, create a 4/4 colorless
Shadow creature token.
Act of Treason — At the beginning of combat on
your turn, you may pay {1}{r}{r}, if you do, you
may untap and gain control of target creature
until end of turn, unless it's controller pays {2}.
Colorless spells you own have cascade.