I don't really know how many of these fill a need in cubes but I like making cards and I made a bunch.
Raving Scholar
Creature - Human Wizard (U)
Attacks each turn if able.
Inspired - Whenever Raving Scholar untaps you may discard a card from your hand and draw a card.
2/2
Dour Groan
Sorcery (U)
Put a 2/2 black zombie creature token into play tapped.
Whenever a creature an opponent controls dies, you may pay
to return Dour Groan from your graveyard to your hand.
(this was a card I made for kinda limited power level, it could use some work and could be reworked for cube)
Unhinged Academic
Creature - Human Wizard (C)
When Unhinged Academic enters the battlefield look at the top 3 cards of your library and put 2 of them into your graveyard.
2/1
(Could be
)
Shadowy Informant
Creature - Shade
Intimidate
At the beginning of your upkeep look at the top card of your library, you may put that card into your graveyard.
2/1
Slanderous Gossip
Instant (U)
Draw 2 cards then discard a card from your hand.
Target player loses 2 life.
Just Reckoning
Sorcery (R)
Destroy all creatures and gain 4 life.
Contemptuous Edict
Sorcery (U)
Target player sacrifices a creature, if a token is sacrificed this way, draw a card.