This card uses casualty , which allows you to sacrifice a creature to copy the spell
Careful selection transforms an average deck into a competitive powerhouse
Youll never activate that in Commander, at least not more than once in a few dozens game at most, so Im judging this card based on its power on rate
The attack trigger has a reasonable chance at hitting something too, partly because of the Multiverse Legends bonus sheet, which guarantees every pack has at least one legendary creature in it
The -1/-1 counters and +1/+1 counters cancel each other out in a 1:1 ratio as a state-based action
Also, there are situations where you dont want to trigger Prized Amalgam, for instance, you play around Ugin minus ability or vs Anger of the Gods and you have Silversmote Ghoul/another Amalgam triggered to return at your endstep, or fetchland + Bloodghast ready to return your 3/3s on the opponents endstep