I was playing against a D/D/D player using this card, the card text says I cannot tribute for tribute summons specifically(or use them for Xyz/Synchro/Fusion material). I was playing BLS at the time, so I tried using the effect of Gaia, the Mid-knight Sun on my White Dragon Wyverbuster. It wouldn't allow me to activate the effect, so I tried to play my Super Soldier Ritual in hand to Ritual Summon a BLS monster, but it wouldn't let me use the two monsters on the field. But yeah, it's preventing other forms of tributing not mentioned by the trap's effects.