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A 2/3 Human Cleric for the low cost of three mana, when Jerren enters the battlefield or whenever a nontoken Human under its owner's control dies, Jarren's controller loses one life and creates a 1/1 Human token

There are three Dungeons that you progress through and although at first I thought that that would be a low number, it seems to work out well and gives you plenty of options to choose from

Unfortunately there's only 4 summons in the entire deck, which I think is a shame

From there you can catapult out ahead of your opponents, since your Sol Ring now taps for three mana while Basalt Monolith now creates infinite mana since youre always up one mana every time you untap it