(Thankfully you can check how many you currently have by checking in your card collection.) Here's the card you'll need to collect 100 times for 'A Sweet Party of Epic Proportions': x100 Milcery #36 (One Diamond) Reward: Alcremie Emblem Extradimensional Crisis Museum 1 'Extradimensional Crisis Museum 1' tasks you with collecting six specific Full Art cards, including Celesteela and Alolan Meowth (a rather sassy-looking version of Meowth too)
if youre lucky, this deck will carry you to plenty of wins
A meaty 210 HP with 120 DMG for only 2 Energy
Considering Wizards generally doesn't restock products outside of the last few years of the game, anything from before Throne of Eldraine will likely be bought through secondary markets where Wizards doesn't receive a cut of the sale anyway
But, as with all ability words, you really need to check on a case-by-case basis : Naga Fleshcrafter, for example, is limited to nonlegendary creatures under your control
It can attack, although not the turn it comes under your control