A decomposition of a graph into isomorphic copies of a graph is -magic if there is a bijection such that the sum of labels of edges and vertices of each copy of in the decomposition is constant. It is known that complete graphs do not admit -magic decompositions for . By using the results on the sumset partition problem, we show that the complete graph admits -magic decompositions by any graceful tree with edges. We address analogous problems for complete bipartite graphs and for antimagic and -antimagic decompositions.