Tidy Conclusion

Five mana for unconditional creature removal is a steep tax, and that price tells you exactly what kind of design this is: instant-speed kill spells that ask nothing of the target have long been pushed toward the top of the curve, where the rate gets paid down by an attached upside rather than a discount. Here the upside is grafted onto an artifact count, which means the lifegain clause is dead weight in a deck that does not commit to artifacts and a genuine swing in one built around them. That conditionality is the whole design proposition: the spell pays full retail for guaranteed removal, then refunds the difference only if you have already built the board to redeem it. Destroy effects that gain life scaled to your own permanents are a recurring shape, but pinning the rebate to artifacts specifically marks this as a piece written for an artifact-matters environment, where a player untapping five mana with a developed board is also a player sitting behind enough hardware to turn the gain into a real life cushion against an aggressive opponent. Strip the artifacts away and the card collapses into overpriced removal any black deck can cast but few should; it only earns its slot when the second half of the text is doing as much work as the first.