In MTG Standard a deck can only contain a max of four of the same type of card, and singleton formats like Commander only allow for one of each card
You can also purchase wildcards with real money, if you want or need to simply head to the store and check out the bundles of wildcards on offer
Dimir Keyrune
Light-Paws, Emperor's Voice A good aura Light-Paws, Emperor's Voice is a two-mana White 2/2 that reads: "Whenever an Aura enters the battlefield under your control, if you cast it, you may search your library for an Aura card with mana value less than or equal to that Aura and with a different name than each Aura you control, put that card onto the battlefield attached to Light-Paws, Emperors Voice, then shuffle." This is undoubtedly going to be an almighty card in Commander but, given how potent the ability is, we wouldnt be surprised to see this at the forefront of an aggressive aura deck in other popular MTG formats too
As you can see, cards will state specifically what they can target with the description of an object after the word "target"