maybe eternity for deck elongation (with time mark), pulvy is always a good option, though it's heavy on quanta. jade/druidic staff is good for healing, and you're not using too much
or
yet. I've read on another thread that for speed rainbows (30 cards), supernovas can be used with very little pillars/towers and entropy mark.
trident is too costly usually
vampiric doesn't heal/damage enough generally
dischord doesn't have much effect against many decks
farenheit doesn't have the effect with such a small
generation
morning star is good if you're afraid of steals
arsenic is ok...but not really for this deck
eagle eye if you're afraid of creatures, but it's heavy on quanta
titan is....titan...if you're afraid of shields, i guess
lobo if you're afraid of abilities, not too hard on quanta either