There are pretty clear lines between the ones youll want to play and the ones thatll live in your bulk boxes, but you cant deny that Magic designers have figured out how to balance big, imposing, costly creatures since the first Leviathan
Go get em: This is an ongoing ability that will give any alien character Challenger +2 and the ability to challenge ready characters on the same turn
Once it has no counters, sacrifice the Ballista to Carrion Feeder or another outlet
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Just look at this How does one evaluate a card like this in a draft where you can also open Sol Ring, Swords to Plowshares, Flash, Ancestral Recall, The One Ring, Ragawan, Force of Will, Lightning Bolt and all the other very, very powerful cards that are in the Vintage Cube
Notably, the card contains an artistic error: Alakazam is missing the star on its forehead (present on Kadabra) because Sugimori mistook the mark for shading when finalizing the official artan original design oversight that makes the card historically valuable