Its Celebration ability is easily used with Rat tokens, enchantment Roles, and white cards like Hopeful Vigil
All somewhat rough choices however the only totally incorrect one is the one without the life gain
Pinkie would play group hug in commander of course, but also fire off a confetti cannon whenever you make a big play
The less you have to pay for these types of effects, the better that way, you can start to repopulate the board immediately on the same turn, putting you in position to be the first one that untaps with creatures, and the first to attack again
For example, you'll receive 2 free rares if you buy 1 additional item (2 total items), 4 free rares if you buy 2 additional items, 6 free rares if you buy 3 additional items, and so on