It can come out larger the further you are into a game, and benefits from other cards that can put counters on it
Curve Dragons tightly and include haste enablers so new tokens impact the board the turn they arrive
Before we go any further, however, a quick decklist: Creatures (34) 4 Lovestruck Beast 4 Questing Beast 4 Yorvo, Lord of Garenbrig 4 Syr Faren, the Hengehammer 2 Nylea, Keen-Eyed 3 Kogla, the Titan Ape 2 Ashaya, Soul of the Wild 4 Tangled Florahedron 3 Old-Growth Troll 4 Kolvori, God of Kinship Lands (21) Spells (5) As proof of concept, heres a Mono-Green Legends deck that exactly meets the suggested nineteen legendary creatures
Magus of the Moon Blood Moon is one of the most frustrating cards in the entire game, so naturally the creature version of it is going to be the same
I imagine some scribe drawing these in a dark, rarely used library corner