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Sky Striker Mecha - Eagle Booster and Called by the Grave are your top priorities here

This is still essentially an aura, and since its not facile to generate +1/+1 counters across mana creatures (aside from something like Jiang Yanggu, Wildcrafter), its going to be hard for this to generate more than +3/+3

Secret Lair: Doo-ay Noo-lah Between these Universes Beyond reprint Secret Lairs, Doo-ay Noo-lah is the weakest one by quite a long shot

Equipment that can help you ramp include: Explorers Scope which is already in the precon deck Dowsing Dagger which transforms into a land Prying Blade and Goldvein Pick which add treasure to the board Sword of Feast and Famine is an expensive include option

Decks with plenty of forests basically get to enjoy a personal Mana Flare

Stack that lifegain early, cast Licia for next to nothing, and start smashing