yes. hapatra cares about any effect you control putting -1/-1 counters on any creature.
...which includes you playing a creature such as Canker Abomination. Entering the battlefiled with -1/-1 counters also counts as putting -1/-1 counters on a creature.
122.6. Some spells and abilities refer to counters being put on an object. This refers to putting counters on that object while it’s on the battlefield and also to an object that’s given counters as it enters the battlefield.
So I have a question about Hapatra, Vizier of poisons her second ability, it takes affect even when she doesn't give the -1/-1 counter correct? lets say I use Fevered convulsions to give creature a -1/-1 counter if im correct that would trigger Hapatra, Vizier of Poisons
UR Mizzix of the Izmagnus ~~~ Build your own win-condition: Finite Spellslinging
UR Brudiclad, Telchor Engineer ~~~ We are the Borg. We will add your biological and technological distinctiveness to our own.
WUB Oloro, Ageless Ascetic ~~~ A Guide to dying slowly
UBR Marchesa, the Black Rose ~~~ Marchesa's undying Marionettes
RGW Mayael the Anima ~~~ All Hail the Big Chungus
GWU Chulane, Teller of Tales ~~~ Permanents Only ETB Shenanigans
BGU Sidisi, Brood Tyrant ~~~ Sidisi's Restless Servants
WUBRG The Ur-Dragon ~~~ Dragons eat your face
Entering the battlefiled with -1/-1 counters also counts as putting -1/-1 counters on a creature.
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