It's a land that taps for Green, and it enters tapped unless you control three or more Forests
Outside of the overtly obnoxious, theres Demilich, which is a four-mana 4/3 that costs one less to cast for each instant and sorcery youve cast that turn
Those of you familiar with the Yu-Gi-Oh
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If your deck is trying to cast as many X spells as possible every turn, and wants X to be as much as possible, we probably want to prioritize ramp more highly than just 8 or 10 spells - in fact, I can see running 60 mana sources, like this Vaevictis Asmadi, the Dire deck
Nosepass, too, has a unique move which prevents all damage depending on a coin flip a very helpful stalling tactic