I think of cards like this when I think about designing limited formats / beginners cubes:
Word of Weakness
Enchantment - Aura (C)
Enchant creature, flash
Enchanted creature gets -2/-2.
Or
Word of Weakness
Enchantment - Aura (C)
Enchant creature, flash
Enchanted creature gets -3/-3.
Stinking Pile
Creature - Ooze (C)
When Stinking Pile enters or leaves the battlefield you lose 1 life.
4/4
Ruby Drake
Creature - Drake (U)
Flying
When Ruby Drake Enters the battlefield, you may put a instant or sorcery card from your graveyard on top of your library.
2/1
Rage Drake
Creature - Drake (U)
Flying, haste
At the end of your turn, if Rage Drake did not attack, sacrifice it.
3/2
Daughter of the Woods
Creature - Elf Druid (C)
If you payed the kicker cost Daughter of the Woods enters the battlefield with two +1/+1 counters on it.
: Add
to your mana pool.
Kicker -
1/1