3/5 Lots of interactions! Maybe a little exploitable with mass CC or poison (mass poison would give a +1|+1 for each creature poisoned, every turn!)
Name: Conservator | Conservator
Element: Aether
Cost: 3 | 3
Type: Creature
Atk|HP: 0/3 | 0/5
Text: Conservator (passive) while Conservator is in play, all other creature stats cannot be altered.
Notes: Conservators are not affected by other Conservators passive ability.