Tablet of the Guilds

As Tablet of the Guilds enters the battlefield,
choose two colors.
Whenever you cast a spell, if it's at least one of
the chosen colors, you gain 1 life for each of the
chosen colors it is.
"The Spacing Guild and its navigators, who the
spice has mutated over 4,000 years, use the orange
spice gas, which gives them the ability to fold space."