Unfortunately, it is hard to calculate specific value for defense team, but it is generaly do not need to meet certain values as high as on offense. Allow me to quote @Kerridoc for this matter:
On defense, the general wisdom is that Mana troops are superior. The Crit bonus is only applied on the occasional “slash” attacks, which occur far less often on defense than tile hits on offense. Also the mana increase is more valuable: mana on offense is gained in discrete packets from each tile, while on defense heroes gain mana both from tile hits and gradually. Therefore, even lower-level mana troops like these can have a meaningful effect on how quickly they cast.
It’s not exactly 1 mana for 1 tile hit on defense:
on offense, a hero only gains mana by matching tiles (unless boosted with a gain-mana buff from, say, Alberich). You gain one tile’s worth of mana when the tile hits a foe, or two tile’s worth if it “ghosts” (doesn’t hit a foe). Certain troops or specials increase the amount of mana each tile is worth.
on defense, every hero gains a tick of mana each turn. Any hero hit by a tile will gain a chunk of mana; the chunk size decreases the more tiles hit in a particular turn (so a huge cascade may not charge all foes’ mana). Again, mana-boost troops and specials may increase the mana gain.
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