If you manage to do all four in a single turn, you can also transform Avatar Aang into Aang, Master of Elements a flying creature that reduces spell costs significantly, and lets you transform back for life gain, card draw, counters, and damage
Since youre getting 30 Play Boosters in the box, youre paying about $4.80 per pack
You should win as soon as you have Ygra in play and two Cauldron Familiars between your battlefield and the yard
Any of the lord slivers make great targets for this enchantment, plus you can double up on the pseudo-lifegain effect provided by Essence Sliver since it isnt keyworded
If you wanted to take a look through every card, ever, including tokens, ad cards, Art Series cards, Schemes, Vanguard cards, and who knows what else, that final number comes to a titanic 99,599 cards from across Magic's history
While it's not a permanent solution, it is certainly a frustrating one