Mount Doom, a red-black land that hurts you when it makes mana, can also hurt your opponents and act as a board wipe if you sacrifice it and a legendary artifact (like The Ring)
The fact of the matter is that there is a very good reason to run 61 cards in a deck that might otherwise want 60mana ratio
Dimir Informant, Dream Eater, Watcher in the Mist, and Whisper Agent all have enter-the-battlefield Surveil triggers
I expect itll put in work in the 99 too, as a support piece to the likes of Sidisi, Brood Tyrant
3 Glaceon ex Overwhelming The Opponent With Frigid Temps Glaceon ex may seem rather underwhelming at first glance in terms of how much damage it can deal to opponents, but upon closer inspection, it can actually be very useful for players looking for cards with a focus on strategy