From the 2020 Summer Drop Bundle from WotC's Secret Lair Drop Series
(If this creature has no +1/+1 counters on it, put a +1/+1 counter on it.) Whenever one or more +1/+1 counters are put on Knighted Myr, it gains double strike until end of turn
Include a mix of color-fixing lands, utility lands, and basic lands for a strong mana base
Invasion of Alara A-Tier: One of my picks for sleeper battle for Pioneer and maybe even Modern
Thanks to the unique partner ability, friends forever, you often see Bjorna alongside Wernog, Rider's Chaplain, as the latter provides you with the artifact tokens Bjorna needs
Heres how it plays out: You are required to have The Gitrog Monster out, Dakmor Salvage in hand and more than 7 cards in hand total At the end of the turn, discard down to hand size, discarding Dakmor Salvage This gives you a draw card trigger from The Gitrog Monster Priority passes to opponents On resolution of the draw trigger, replace this with the dredge from Dakmor Salvage, milling 2 cards and returning Dakmor Salvage to hand As it is still the cleanup step you still need to discard down to 7 cards in hand, again discarding Dakmor Salvage and repeating the combo above on a loop The idea is you loop this to fill your graveyard and try to win from there
