Ixalan

Blinding Fog | Instant | | Prevent all damage that would be dealt to creatures this turn. Creatures you control gain hexproof until end of turn. (They can't be the targets of spells or abilities your opponents control.) | Igor Kieryluk

Crash the Ramparts | Instant | | Target creature gets +3/+3 and gains trample until end of turn. | Mark Behm

Crushing Canopy | Instant | | Choose one — • Destroy target creature with flying. • Destroy target enchantment. | Tomasz Jedruszek

Pounce | Instant | | Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.) | Lucas Graciano

River Heralds' Boon | Instant | | Put a +1/+1 counter on target creature and a +1/+1 counter on up to one target Merfolk. | Alex Konstad