Not only can it be played as a rush card, but only if your Leader card is a Whitebeard Pirate, it even nerfs your opponents attacking cards at the same time.
This will see a very small amount of play in Commander and will probably be worthless beyond that
Task Search Checklists Planechase is a multiplayer mode built for two or more players, though more than two is recommended
Thanks to the recent price increase, Halvar, God of Battle (showcase) is currently the second most-valuable card from Kaldheim behind Vorinclex, Monstrous Raider (showcase) topping popular cards like Goldspan Dragon, Valki, God of Lies, and Koma, Cosmos Serpent (showcase), so I wouldn't expect to see it go much higher
Even in the English metagame we had differences: Blue Doflamingo and Katakuri worked well alongside the tier 1 decks (Zoro, Law, Newgate) in America, in Europe we had
Utilize dinosaurs with enrage like Polyraptor and Silverclad Ferocidons for additional competitive value