Sakura, Blooming Blossom

Flying

{r/w}: Target creature without lifelink gains lifelink
until end of turn. If this is the second time this
ability has been activated, put a +1/+1 counter on
Sakura, Blooming Blossom. If this is the fourth time
this ability has been activated, gain 4 life. If this is
the sixth time this ability has been activated, double
your life total.