Bucky removes and places his next block, watches the tower shift a little, then nods to Vision to take his turn.

Vision studies the tower intently, pulls a block, sets it carefully on top-- and phases his hand through the tower rather than lift it away. "Vis!" Wanda scolds. "That's cheating."

"Apologies," Vision starts, looking sheepish. "I will--"

"Why not try it?" Bucky asks. "That trick's not going to help you take a block or shield it from bad placement. So you've got an advantage. Bet it's not enough to win." He smiles at Wanda. "Same goes; I bet you can use fine control to stabilize things, but what happens when you let go? I'm pretty sure the agent has some tricks up her sleeve, too."