Whiptongue Hydra I have regularly extolled the power of Whirlwind in the modern Commander metagame as well as multiplayer generally
When gold cards were first introduced, not only were many of them not particularly strong, but they had a unique restriction all their own, because these cards weren't just special
Regularly updating your knowledge about this card and its current market value can help you make informed decisions, whether you're looking to buy, trade, or sell
We often have cards that improve or net you a bonus when other things are played or come into play (I hate that "play" means two different things in the same sentence)
If we first look at Standard, we can see there are plenty of spells players want to cast that cost five or more, especially Leyline Binding (which never really costs five), and the enchantment side of Virtue of Persistence
As soon as you throw some non land cards into the mix you massively increase the number of cards you need in your deck to find fatal, far beyond what you want to play in cube