in this scenario, the Electromancer effectively generated 2 mana
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It has a few things going for it: stealing Fable tokens for two mana, the copying a creature part making it a late game bomb that can help you go over the top, and being a sorcery it helps you fill up your graveyard enabling the Treasure Cruises
Then we have a few ways to turn lands into Swamps
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Summon: Yojimbo: On turns where the effect of Summon: Yojimbo's second or third chapter ability is applying, your opponents can choose not to attack with a creature that must attack if able as long as there is no other player, planeswalker, or battle for that creature to attack that wouldn't require a cost