The restriction on Irencrag Feat neatly (if not so gracefully) prevents it from unbalancing ritual-loving decks like Storm by limiting what you can do with your mountain of mana
Alsoand this is relevant to all four preconsthe mana bases are still laughably bad
Inferno Titan does this too, and it is likely the best at it
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Esper Sentinel: If a noncreature spell was already cast by an opponent the turn Esper Sentinel enters the battlefield, that opponent already cast their first noncreature spell this turn, and Esper Sentinel's ability won't trigger for that opponent that turn
Its just as restrictive, but wolves/werewolves have heavy support, and the card draw and damage output between the front face and Tovolar, the Midnight Scourge is unreal
Financial Value & Rarity: For collectors and investors, greatness" is often synonymous with "most valuable." Ultimately, high MTG card value is tied to scarcity, power, and nostalgia