These multi-stage spells are usually reserved for Enchantments and accumulate different effects each turn with the addition of lore counters
This same thing was picked up quite a while back on a different card from the very first Disney Lorcana cards
I wont be suggesting creatures that are legendary, but other card types are completely valid
Underworld Breach can be solved with Damping Sphere, but given that Rest in Peace also gets the job done in that match-up, it earns the full four sideboard slots
Rise of the Eldrazi The mana cost on Rise of the Eldrazi is no joke, but if you're ever going to cast a 12-mana spell, this is what it needs to look like
Deck Filters Mole Man, Moloid Master 24%inclusion 22%synergy 50 decks 211 decks Dancing from Dark to Dawn 6.3%inclusion 6%synergy 1 decks 16 decks Misty Knight, Hero for Hire 6.3%inclusion 6%synergy 13 decks 208 decks Origin of Thor 4.6%inclusion 4%synergy 9 decks 197 decks Spider-Man, New Champion 4.1%inclusion 4%synergy 8 decks 197 decks High Synergy Cards Summon: Titan 74%inclusion 73%synergy 1.13K decks 1.53K decks Summon: Fenrir 67%inclusion 65%synergy 1.02K decks 1.53K decks The Mending of Dominaria 52%inclusion 51%synergy 800 decks 1.53K decks Summon: G.F