In Commander this could close out a game if you're going wide with a Krenko or something, and it can be found with Moggcatcher
Here is a list of the cards I have noticed: Lighthouse Chronologist, Artificer Class, Barbarian Class, Cleric Class, Druid Class, Fighter Class, Monk Class, Paladin Class, Ranger Class, Rogue Class, Sorcerer Class, Warlock Class, Wizard Class Phyrexian Dragon Engine Meld seems to have a similar issue.
Like disturb or embalm or any of those sorts of effects, you can only counter it with Stifle effects
Harness Infinity Card Harness Infinity Card Illustrated by Seb McKinnon Not Legal This card is memorabilia and not legal for play
BT25 either pulls more players to the deck (confirming the efficiency) or thins the pool further, and we find out whether the headline survives a wider sample
When you finish comboing off you'll have as much mana as you need, a bunch of enchantments on the board, and probably not many cards left in your library