There are aggressive and control decks using black, blue, and white, but the only top build using either red or green right now is a ramp deck
Here are some things I have learned from my time building and playing a non-poison tribal cube - 1 Non-tribal play will be played even if you only have tribal creatures (and that's ok)
Like Card not found, Card not found from Urzas Saga (1998) isnt really card advantage, but it does have a mana edge over Tribute
Thoughtful, clean art can be easier to read than some original, busy prints
Esper Sentinel Card draw on a human Esper Sentinel is a one-mana White 1/1 that reads: Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays X, where X is Esper Sentinels power. On the face of things, that means you get to draw a card unless your opponent pays one mana
Squirreled Away combines a popular typal theme, with tokens and food, with a lot of really good value