While I general I'm a little wary of mixing +1/+1 and -1/-1 counters (as it can get very confusing what the size of things arethis, by the way, is where the rule about +1/+1 and -1/-1 counters canceling one another out came from), I do like how this card uses both in a contextual way that gives the card a strong flavor
The true banger is this cards activated ability
Basking Broodscale provides a rather innocent boon with some Eldrazi Spawn whenever it gains counters
For example, the third lore counter put on a Saga causes the III chapter ability to trigger, but I and II won't trigger again
Even mono color commanders can make this excuse to enjoy fetch lands in their deck Fetch Lands in Modern, Legacy, Commander, Cube, and More There are multiple uses of fetch lands in theory, but how useful are they in practice
Flying When Aang enters, look at the top five cards of your library