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Because Wastes is a basic land, you can include as many of them as you like in your Constructed decks

The existing decks that will probably include Karn in their 75 are GB Constrictor, Mardu Vehicles, and Grixis/UB Improvise

While youll see the benefit of +1/+1 counters on your creatures, your opponents will draw cards as a reward for attacking someone else with a high life total

Its possible if you try to hurt a card, but it will not happen from regular use

You have card advantage for grindy games, lifegain against aggro, the ability to enable all your infusion cards immediately, and removal

Chernabog features in the 1940s animated Disney film Fantasia and whilst he isn't the most expensive Enchanted in Into The Inklands, he is still over $100