Tempered Sliver [Modern Horizons] Countdown Calendar Promos Reveal the player you chose:

Reveal the player you chose: Exile target creature that's attacking you if it's controlled by the chosen player

OR unequip the Union equipment and Special Summon this card in face-up Attack Position

The effects of all face-up Trap Cards are also negated

your opponent's cards and effects cannot be activated until the end of the Damage Step

But I'd never seen anything as dreadful as that

Tempered Sliver [Modern Horizons] Countdown Calendar Promos Reveal the player you chose:Set: Modern Horizons Type: Creature Sliver Rarity: Uncommon Cost: {2}{G} Sliver creatures you control have "Whenever this creature deals combat damage to a player, put a +1 +1 counter on it." The question isn't whether slivers will adapt to a world's perils but whether the world's perils will adapt to slivers.