Ichthyomorphosis - 3.5 Removing the creatures abilities adds to the card's value
Fighter Class and Birthright Boon (from Kellan, the Fae-Blooded) are also flexible pieces that both tutor and help with equip synergies
Its two outcomes are powerful bonuses: either drawing a card (which adds about two mana to a cards cost, maybe a bit less) or getting a +1/+1 counter and Surveil 1 (which adds about the same)
The only catch is that it can only target creatures with a converted mana cost of three or fewer
I could be wrong about that, but usually a deck that focuses down on one or two things will do better than precons, which famously suffer from something akin to multiple personality disorder
Theres EIGHT Gilded Drakes (PL, LP, GD), NINE Lions Eye Diamond (LP, GD, EX) and SIX Mox Diamond (PO, EX, NM)