Number 0 Language English Legal Formats Commander, Legacy, Pauper, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Modern, Pioneer, Standard, Timeless Rulings (10/4/2004) The additional mana is not an ability of the land and is not something the land can produce.
If this creature's controller can prevent it from being blocked and can put at least one merfolk into play each turn, it can effectively be used to chain countless turns together, winning the game for its controller
These typically have more distinct rules, and may require you to tweak or rebuild your decklists
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 Once Upon a Time: The earliest opportunity you have to cast Once Upon a Time is during the first player's upkeep, before that player can play a land
A 2/3 with deathtouch is great in UB, especially since the game plan against aggro is usually to stabilize early, trade up efficiently, and start generating card advantage
While some cards will be recognizable, some might raise an eyebrow