Here, Sisay, Weatherlight Captain, is the right choice
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This helps you in the long run, as when an opponent uses a spell or ability casts using mana from a Treasure, you put a +1/+1 counter on any creature and draw a card
It's often scalped and sold at ridiculous prices, and when it does become available, it sells out almost instantly
This is somewhat of a 2 mana Deflection, yes you can only do things that target you and not your stuff, yes, you have to have spell mastery for the full effect
I considered playing a second Pyrite Spellbomb instead, as a lot of the time you want Pyroclasm, youre only really trying to kill one creature, and its relatively painless to draw when its bad instead of completely blank