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That's why Upheaval is such a bomb: there are virtually no ways to deal with it, and once it is cast you can end up with two to three creatures plus a land on the board while your opponent literally has nothing, and has a hand full of sixteen cards they need to discard down to seven
With so little removal, and highly synergistic cards, items are likely going to remain one of the most powerful deck archetypes for quite a long time in Lorcana
Thats insane value, and even if you lose your 4-powered creature, you get to put a +1/+1 counter on a 3/3 and start the process over again
Copy a creature with a strong enter-the-battlefield effect, and you get the payoff again ( Dockside Extortionist = ungodly amounts of mana)