Deadly catalyst Disk, is it good?

That disk is the only reason I've gotten to max crate in conquest 7 and 8. It let's a mediocre team win a fight it would have no chance at otherwise. As stated above is only useful if you have it paired with some ruthless swiftness discs. If you can find a team that heals itself a bit, like bossk lead BH, then you can get endless turns while you focus one enemy down. You just hit someone else at full health or use an aoe when you need a TM boost. Excellent for those faction feats that you don't have a relic team of the faction.