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You don't choose a target for Serum-Core Chimera's last ability at the time you activate it

Chasm Skulker As you draw cards, Chasm Skulker gets massive

Its best target is Experimental Synthesizer, which digs through your library for more spells while you stick a 2/2 flier to the board for 1 mana

Like most Magic: The Gathering cards, the value of Soul of Theros depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Magic 2015)

To add to this, 4 copies of Kronch wrangler are early game threats which grow stronger with each large creature you cast, and the deck additionally adds copies of Garenbrig Paladin, Challenger Troll, and Beanstalk Giant for extra firepower

(The copy becomes a token.) A resolving copy of a permanent spell becomes a token, so the token isn't "created." Effects that care about a token being created won't interact with a token that enters the battlefield from Archmage of Echoes's ability