With nearly 6,000 votes cast, Forced Fruition beat out Endless Horizons by almost 400 votes
With EX06s Mirei Mikagura, Mastemon can keep up with faster decks by cheating out Digivolution costs and ending the turn with a Mastemon on board that your opponent will have a hard time dealing with
Mechanics which affect the cost of other spells are also very popular, and often among the more powerful effects in the game
Rival Flareon (VMAX Climax [S8b] 188/184) (PSA 10 Price: ~US$80) Trainer: Blue Trainer: Blue Flareon CHR[s8b 188/184](High Class PackVMAX Climax) Blue, the original rival from Gen 1, took an Eevee as his starter in Pokmon Yellow
Mayaels Aria is also worth bringing up since its the most accessible price-wise in a decade after its Surviving to Upkeep One thing you'll notice that all these cards have in common is they trigger at the beginning of your upkeep, which poses the inherent problem of projecting your win condition to the field potentially multiple turns before you can pull it off
This also applies in reverse to the three Synchro Monsters automatically obtained before the match against Team New World - the player is supposed to not keep the cards and they will disappear if the player exits the Deck Editor with the cards not being in their Extra Deck or Side Deck, but saving a Deck Recipe that has any of those cards will let the player keep them