At just U, the Bottomless Pool side offers a cheap, reusable bounce effect that could provide some interesting tempo plays in limited
Beginners in Magic really dont need much space at all
In 2007, red received a timeshifted version of this card via the Planar Chaos set with the same ability (a +3/+3 boost to a single creature for one red mana)
When the zombie naga comes into play, you can sacrifice a creature
Best Pump Spell Payoffs Some number of creatures just want to be targeted with pump spells, whether that's Ashroot Animist so it can transfer that pump to other creatures when it attacks, or The Howling Abomination, which deals massive damage when targeted
Green cards work for many archetypes (control decks, tempo decks, defensive decks)