Everyone underrated this card the first time around, in Theros block
The ability enhances combat strategy by making it harder for opponents to block attacking creatures, thus favoring aggressive play styles
(One preposterous example: a creature that cant be blocked as long as the spellcasting player is wearing denim.) See also: 'Magic: The Gathering Arena' Closed Beta Play Begins Now First came 1998s Unglued, then 2004s Unhinged
A Temur-based Elemental Dinosaur, Kalamax encourages its controller to build a deck heavily around instants, as whenever its controller casts their first instant spell each turn, if Kalamax is tapped, they get to copy that spell and choose new targets for that copy
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