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
Once thats decided, its time to answer the question, How many cards do you start with in Yu-Gi-Oh
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