Just having the ability to be a scary threat or be big as a cheap card doesn't mean you are a good tempo card
The equip cost for Planisphere is rather small, as well, allowing players to reequip the Planisphere to anything, turning them into massive potential threats
The combination of an efficient 4/3 flyer for 5 mana with a one-card win condition is intoxicating
Demilich In Modern, were currently seeing a resurgence of UR Delver-style decks brought about by Modern Horizons II all-stars Ragavan, Nimble Pilferer, Dragons Rage Channeler, and Murktide Regent
The best cards are ones that either make other cards provide mana of any color like Chromatic Lantern, tutor for lands, or provide multiple mana in any combination of colors
[card]Phelia, Exuberant Shepherd[/card], [card]Restoration Angel[/card], and [card]Aether Channeler[/card] allow blink loops that protect your board while re-triggering enters-the-battlefield effects