Frontline Medic

Battalion — Whenever this creature and at least two other creatures attack, creatures you control gain indestructible until end of turn.
Sacrifice this creature: Counter target spell with {X} in its mana cost unless its controller pays {3}.

Molten Influence

Counter target instant or sorcery spell unless its controller has Molten Influence deal 4 damage to them.

Mana Tithe

Counter target spell unless its controller pays {1}.

Avoid Fate

Counter target instant or Aura spell that targets a permanent you control.

Lifeforce

Pyroblast

Choose one —
• Counter target spell if it's blue.
• Destroy target permanent if it's blue.

Tibalt's Trickery

Counter target spell. Choose 1, 2, or 3 at random. Its controller mills that many cards, then exiles cards from the top of their library until they exile a nonland card with a different name than that spell. They may cast that card without paying its mana cost. Then they put the exiled cards on the bottom of their library in a random order.

Order of the Sacred Torch

{T}, Pay 1 life: Counter target black spell.

Lapse of Certainty

Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

Guttural Response

Artifact Blast

Red Elemental Blast

Choose one —
• Counter target blue spell.
• Destroy target blue permanent.

Mages' Contest

You and target spell's controller bid life. You start the bidding with a bid of 1. In turn order, each player may top the high bid. The bidding ends if the high bid stands. The high bidder loses life equal to the high bid. If you win the bidding, counter that spell.

Vigilant Martyr

Sacrifice this creature: Regenerate target creature.
{W}{W}, {T}, Sacrifice this creature: Counter target spell that targets an enchantment.

Equinox

Enchant land
Enchanted land has "{T}: Counter target spell if it would destroy a land you control."

Rebuff the Wicked

Counter target spell that targets a permanent you control.

Illumination

Counter target artifact or enchantment spell. Its controller gains life equal to its mana value.