During today's Pokmon Presents showcase, we saw players swipe to open virtual packs of Pokmon trading cards, which could then be interacted with in various ways
There was actually reference to this card in a little booklet that came with the Sword & Shield Ultra Premium Collection
You may play as many item cards per turn as you like
Bloodghast serves as a blocker, attacker, and even sacrifice or discard fodder
So to power your deck down, you can consciously limit your deck - removing interaction, increasing the mana cost of your ramp (for example swapping a Mana Crypt for a Hedron Archive) or removing it, and increasing how easy your game plan is to interrupt (which will reduce its potency)
Once you get a feel for these card types, youll realize Trainer cards are the secret sauce that makes decks tick