Someone always pushes the envelope and most groups have a player or two who are either less experienced or less focused on winning, but parity is still a good thing to keep in the back of your mind
The low casting cost and seductive wording of that ability has tempted many players to try this out, only to realize the brutal mathematics involved
"Oversize cards" is not a "set" by the usual Magic definition, but I'd guess your online store categorizes them that way to make it clearer to customers they're buying an abnormal card
Getting more powerful with every Ally creature cast could make this a force to be reckoned with
It would be only be the seventh most expensive deck in our current Standard format $200 less expensive than Jeskai Black, GW Megamorph, or Five Color Bring to Light
Tinker doesnt even need a second card to be absurd, although frequently it was combined with Time Walk to great effect since all you need to do is untap