The general rule is that you can only Chain to an effect with one of the same Spell Speed or higher
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Butterbur, Bree Innkeeper FromTheShire: I'm actually no sure if this even makes the cut in Hobbit/Food decks since it only triggers if you don't control a Food, and I suspect more often than not you are going to have them laying around at the end of turn, either because you made a ton or just don't have the mana to crack the one you have
Graveyard: When are Spell or Trap card is used, a card is discarded, or a monster is destroyed/used for a Fusion, Ritual, or Synchro Summon, they are put in the Graveyard
You could probably get away with replacing those two
BPhillipYork: Built in Reconnaissance Mission is pretty solid, blue has many ways to make creatures unblockable or give them evasion, and this means you just know you'll have the effect on the turn you want it