Forum:Question about Dandylion + Stray Lambs

So I'm making a deck revolving around Earthbound Immortal Chacu Challhua, and I was wondering; if I were to use the effect of Dandylion or Stray Lambs and then Activate Ultimate Offering, could I tribute summon, or would the effects of Dandylion or Stray Lambs cancel that out? Thanks♥