Magecraft Whenever you cast or copy an instant or sorcery spell, discard a card, then draw a card
(When it dies, if it had no -1/-1 counters on it, return it to the battlefield under its owners control with a -1/-1 counter on it.) Illustrated by Ron Brown Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
It seems appropriate to me to dig a little deeper into these decks and offer some cards that have a little less broad appeal for Cube, but that will fit some specific Cubes very well
Effects that modify a creature's power and/or toughness, such as the ones created by Titanic Growth or a +/1+1 counter, will apply to the creature no matter when they started to take effect
(If this creature isn't monstrous, put five +1/+1 counters on it and it becomes monstrous.) Creature Artifact - Toy Goldvein Pick Equipped creature gets +1/+1