See if you can't figure out how many mana total, and which specific kinds, it takes to summon the following card: The Answer: The first card, (Sylvan Bounty), costs 5 generic manamana of any kind you want along with one green manamana produced by a forest, for a total of six mana
Turning one token that gains three life into something that can draw cards and generates mana, as well as gain three life, is huge
Whatever direction you take The Mycotyrant, whether it's crusty old Fungus cards from nearly 20 years ago, a highly tuned combo deck loaded up with tutors or something in between, I hope if you build around this card you're able to get it to do what you want
Solving this case takes work, but the solved ability offers absurd card advantage, especially since lifegain decks tend to focus heavily on permanents
I think this card will see a fair amount of play in more than a few decks