I feel the need to give out some honourable mentions her
Cards like Waste Not, Liliana's Caress, and Megrim all do good work in a discard deck, but are super useful to have in a wheel deck when you're forcing your opponents to discard every turn
Aggressive decks want to be able to clear away blockers so as to freely attack and they want to do it cheaply so that they can continue to mount up the pressure
1 Ancient Copper Dragon Extreme Hoarders: Faern Edition A card thats as expensive in the real world as the piles of gold in its art would suggest, Ancient Copper Dragon is, unfortunately for your wallet, the best dice-rolling card in Magic by a wide margin
After all, these are likely to be one-off issues only affecting that particular copy of a specific card
But there are still lots of X spells that are awesome in its three colors