Elemental Trio

Double Strike, Vigilance

{r} {t} - Tap to add +1/+3 to all creatures of one type
{u} {t} - Tap to draw 3 cards and discard 1 from your hand
{g} {t} - Tap for one mana of any colour

3{r}{u}{g}{t} - Cast a creature from your hand or graveyard without paying the mana cost.