Kaldheim

Dragonkin Berserker | Creature | Human Berserker | First strike Boast abilities you activate cost {1} less to activate for each Dragon you control. Boast — {4}{R}: Create a 5/5 red Dragon creature token with flying. (Activate only if this creature attacked this turn and only once each turn.) | Lie Setiawan

Magda, Brazen Outlaw | Legendary Creature | Dwarf Berserker | Other Dwarves you control get +1/+0. Whenever a Dwarf you control becomes tapped, create a Treasure token. Sacrifice five Treasures: Search your library for an artifact or Dragon card, put that card onto the battlefield, then shuffle. | Slawomir Maniak

Arni Brokenbrow | Legendary Creature | Human Berserker | Haste Boast — {1}: You may change Arni Brokenbrow's base power to 1 plus the greatest power among other creatures you control until end of turn. (Activate only if this creature attacked this turn and only once each turn.) | Dmitry Burmak

Calamity Bearer | Creature | Giant Berserker | If a Giant source you control would deal damage to a permanent or player, it deals double that damage to that permanent or player instead. | Simon Dominic

Surtland Flinger | Creature | Giant Berserker | Whenever Surtland Flinger attacks, you may sacrifice another creature. When you do, Surtland Flinger deals damage equal to the sacrificed creature's power to any target. If the sacrificed creature was a Giant, Surtland Flinger deals twice that much damage instead. | Dmitry Burmak

Birgi, God of Storytelling | Legendary Creature | God | Whenever you cast a spell, add {R}. Until end of turn, you don't lose this mana as steps and phases end. Creatures you control can boast twice during each of your turns rather than once. | Eric Deschamps

Immersturm Predator | Creature | Vampire Dragon | Flying Whenever Immersturm Predator becomes tapped, exile up to one target card from a graveyard and put a +1/+1 counter on Immersturm Predator. Sacrifice another creature: Immersturm Predator gains indestructible until end of turn. Tap it. | Nicholas Gregory