This requires some set up to be cheap, but its definitely worth the trouble, as double-striking a Clever Lumimancer is no joke
Only the Judges of sanctioned tournaments got these , so supply is much lower and theres no possible way to get this in a booster or starter pack
Tapping four flyers is certainly a real cost, but its not like having a 7/7 flying creature with lifelink is a shields-down moment
Now, consider a Blood Hypnotist who says "the first time each turn you sacrifice a Blood token" - in that universe, I probably end up killing you with some really inevitable Grolnok beats
Even though Endurance is mostly played as a sideboard card, basically any green deck in the format plays it to fight graveyard based strategies
I use Moxfield for sharing decks with my playgroup, Scryfall for card searches, and GrimDeck for tracking what I actually own