At the beginning of your upkeep, change Halfdane's base power and toughness to the power and toughness of target creature other than Halfdane until the end of your next upkeep.
When Halfdane comes into play he is 3/3. During your upkeep, Halfdane acquires the current power and toughness of target creature other than Halfdane. If there are no legal targets, Halfdane becomes 3/3.
Hail from Tolaria the ever changing 'Dane.
