The only issue Metalworker has it that it's a creature and can be killed before you use it
Personally I've been including at least five Trainer cards in each deck I've been running as I like having access to the extra bonuses they offer, but you're free to add as many or as little as you like
Palkia VSTAR, for instance, seems like a good candidate to be paired up with Blastoise
As Cloud Key enters the battlefield, choose artifact, creature, enchantment, instant, or sorcery less to cast
It also lets all lands enter the battlefield untapped, which is really nice and makes this a fantastic inclusion for a lot of decks with budget mana bases
Artist /HISASHI MOMOSE P/T 1 / 7 Set Number 343 Language Franais printings (2) view FIN #191 FIN #343 Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Not Legal Formats Pauper