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It fits the big Boros spell identity perfectly

Weaver of Lightnings triggered ability resolves before the spell that caused it to trigger, but after targets for that spell have been chosen

Creature - Human Rogue Phyrexian Color tag templates(None) Boundary Lands Ranger At the beginning of combat on your turn, if you control a creature with power 4 or greater, you may discard a card

The big difference here is you dont control any permanents to produce mana or sacrifice at the start of a game, whereas the rules let you start with a full grip of seven cards ready to be spent immediately plus another free one each turn

It's a little expensive, but it ultimately draws you three cards and takes one away from your opponent