Chromatic Orb

Chromatic Orb costs {1} less to cast for each basic
land type among lands you control.
{w}{w},{t}: Gain 3 life
{u}{u},{t}: Draw a card
{b}{b},{t}: Target player discards a card from their
hand at random
{r}{r},{t}: Deal 3 damage to target creature
{g}{g},{t}: Creatures you control gain +1/+1 and trample until end of turn