Goldrazor EagleWW Creature — Bird
When Goldrazor Eagle attacks, you may remove a +1/+1 counter or -1/-1 counter from target creature. If you do, gain 1 life. It bears gifts of healing for the weary, but all others it's sent after get sent packing.
Unlimited persist and undying. Counters plaguers. Pseudolifelink.
Strife CondorBB Creature — Bird
When Strife Condor attacks, you may put a -1/-1 counter on target creature. If you do, and it's a creature you control, untap Strife Condor. If you see one day or night, do yourself a favor and run for your life.
Stops persist and powers untapers. Pseudovigilance.
The white one isn't that strong, except for the being able to remove +1/+1 counters from opponent's creatures. The black one being able to repeatedly -1/-1 opponent's creatures is very powerful the untap is effectively meaningless because of it.
Colorwise, removing +1 counters from opponent creatures doesn't make sense in white and psuedo vigilance doesn't make sense in black.
I'd recommend switching the untap and lifegain clauses, and have them only affect creatures you control.
The first one is a really nice design but I think it's fine for W or as a 2/1 or a 1/3. The black one is totally reasonable if you just remove the untap. I'd give him one extra toughness to compensate. Good designs