2019-01-25 : If Galloping Lizrog leaves the battlefield after its ability has triggered, you may remove any number of +1/+1 counters from among your creatures, even though you won’t put any on Galloping Lizrog.

2019-01-25 : If an effect causes Galloping Lizrog to enter the battlefield with +1/+1 counters on it, you may remove those counters with its triggered ability and put twice as many back on it.

2019-01-25 : You remove counters and put new ones on Galloping Lizrog all while its ability is resolving. Nothing can happen between the two, and no player may choose to take actions.