The best replacement for critical mass is critical plus.

The best alternatives to critical mass are rated as following:
★★★★★  critical plus
★★★★★  big bud
★★★★★  mutant mass
★★★★  serious mass
★★★  mammoth 2500
★  evocation

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Speaking about critical mass, one probably shouldn't forget about archon.

Other search terms related to critical mass and their ratings are:
★★★★★ archon
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