You can play as many action cards as you want if you can pay the ink
Words of Wisdom is a funny one, it is more card advantage than card quality but as it doesn't actually give you card advantage over your opponent (the only measure than has any relevance) I can't quite so easily consider it as that either
Price: $58.86 #2: Rakdos, Patron of Chaos The titular patron of the Rakdos guild, this demonic showstopper is back to bring the hurt in Murders at Karlov Manor
You may put an Aura card with mana value X or less from your hand onto the battlefield attached to it
You can play some pretty advanced mind games with your opponent and try bluffing them into choosing your worst cards to shuffle away, or do what I do and just dont run any bad cards
Well, there are cards that change this dynamic, either giving you a huge benefit when you discard your own cards or by punishing people for having few or zero cards in hand