At the beginning of combat on your turn, put a +1/+1 counter on target creature you control. Then if that creature has three or more +1/+1 counters on it, transform Hadana's Climb.
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(Transforms from Hadana's Climb.)
: Add one mana of any color.
, : Target creature you control gains flying and gets +X/+X until end of turn, where X is its power.