Karn, the Great Creator

Whenever a creature you control attacks alone, it gets +X/+X until end of turn, where X is the number of creatures you control.

This creature has vigilance as long as you control a Gate.

Target creature gets +2/+2 until end of turn. Addendum — If you cast this spell during your main phase, that creature gains flying until end of turn.

When this creature enters, detain target creature an opponent controls. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

When this creature enters, detain up to two target creatures your opponents control. (Until your next turn, those creatures can't attack or block and their activated abilities can't be activated.)

Defender Extort (Whenever you cast a spell, you may pay W/B. If you do, each opponent loses 1 life and you gain that much life.)

Flying Creatures can't attack you.

Extort (Whenever you cast a spell, you may pay W/B. If you do, each opponent loses 1 life and you gain that much life.) Artifacts and creatures your opponents control enter tapped.