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These cards shouldn't be counted directly as lands, but three copies of Elvish Mystic can be a fine reason to play, say, sixteen lands instead of seventeen or eighteen in your 40-card Limited deck

First, while cards like Merfolk Secretkeeper and Wall of Lost Thoughts are fine blockers, thanks to their lack of power, they can't ever kill our opponent's attackers

Bloodforged Battle-Axe is great on any creature, but Sword of Fire and Ice is amazing on Cloud, Midgar Mercenary

As far as being upgradable, here are my basic thoughts on the decks

Once online, you can sacrifice your board on each players turn for value, knowing Shirei will bring them all back