Significantly lowers the reaction ability activation rate of targets within range for 3 turns & lowers Magic Attack Res for 3 turns, then deals Dmg (L) based on caster's MAG stat.
Raises Max HP of allies within area around self for 3 turns & recovers the amount of HP raised & bestows Bravery reduction to successful attacks for 3 turns & bestows a barrier on self that reduces Phys Dmg (3 times).
I think the tier list is made for pvp, and reducing AP plus causing frostbite in an area can be a problem for the opponent. Also, reducing reaction chance is useful too, since reactions can be a nuisance. Or maybe the tier list creators just don't feel like fire is that strong, so ice doesn't have much of a weakness.
Collector
I hate this one, because i has pull on 9 step gacha till 6step but still not get him. And why i hate him is, at chocobo expedition zoma always drop and not psaro LoL im only need psaro