Pardon me for the infectious cards, but I hope you have learned more about the best infect cards in Magic: The Gathering
Both of these cards require you to flip them onto the playing area of a height of at least 1 foot (or 30cm, give or take) off the playing field, and it has an effect on any cards that it lands on, and then you put the cards into the Graveyard
Other cards that aren't combo pieces but are key cards from the Block need to be here too
In Magic: The Gathering, where the collector market considers cards to be investments it's frankly barbaric to play an actual game with, the equivalent is an unofficial format called Sharpie Cube, or Redacted Cube
They copy themselves for each spell cast before it, so it's possible to cast enough spells to burn all your opponents with Grapeshot, or mill them all with Brain Freeze if you're able to cast a ton of spells in one turn (made easier with the Hullbreaker Horror combo)