Overwhelm

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature’s color.)
Creatures you control get +3/+3 until end of turn.

Hinder

Counter target spell. If that spell is countered this way, put that card on your choice of the top or bottom of its owner’s library instead of into that player’s graveyard.

Marrow-Gnawer

All Rats have fear.
, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

Twist Allegiance

You and target opponent each gain control of all creatures the other controls until end of turn. Untap those creatures. Those creatures gain haste until end of turn.

Shirei, Shizo’s Caretaker

Whenever a creature with power 1 or less is put into your graveyard from the battlefield, you may return that card to the battlefield at the beginning of the next end step if Shirei, Shizo’s Caretaker is still on the battlefield.

Ink-Eyes, Servant of Oni

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Ink-Eyes, Servant of Oni deals combat damage to a player, you may put target creature card from that player’s graveyard onto the battlefield under your control.
: Regenerate Ink-Eyes.

Hinder

Counter target spell. If that spell is countered this way, put that card on your choice of the top or bottom of its owner’s library instead of into that player’s graveyard.

Ashen-Skin Zubera

When Ashen-Skin Zubera dies, target opponent discards a card for each Zubera that died this turn.

Soulblast

As an additional cost to cast this spell, sacrifice all creatures you control.
Soulblast deals damage to any target equal to the total power of the sacrificed creatures.

Marrow-Gnawer

All Rats have fear.
, Sacrifice a Rat: Create X 1/1 black Rat creature tokens, where X is the number of Rats you control.

Tide of War

Whenever one or more creatures block, flip a coin. If you win the flip, each blocking creature is sacrificed by its controller. If you lose the flip, each blocked creature is sacrificed by its controller.

Call to Glory

Untap all creatures you control. Samurai creatures you control get +1/+1 until end of turn.