Orochi Colony

Whenever a creature you control deals combat damage to a player, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle.
Whenever chaos ensues, target creature can't be blocked this turn.

Whenever a creature you control deals combat damage to a player, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.
Whenever you roll chaos, target creature is unblockable this turn.

March of the Machine Commander

Planechase Anthology Planes

Whenever a creature you control deals combat damage to a player, you may search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.
Whenever you roll CHAOS, target creature can't be blocked this turn.