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While Obosh is still slow as an 8-mana investment in an aggro deck, it gives those strategies something to do in a grindy matchup or with a hand thats drawn a few extra lands
The answer is yes
Abilities that care about the number of creatures in your party simply look for a number between 0 and 4
American audiences are generally more sensitive to depictions of firearms pointed toward the viewer, and The Pokmon Company chose to use different artwork for the international release showing Magmortar in a less confrontational pose
Alternatively, you can substitute potion by using Manaphy to produce more water energy for your benched Pokemons