The Guildpact

The Guildpact is all colors
At the beginning of your upkeep, if you control a permanent with {w/u} in its casting cost, you gain
1 life and draw a card. Then repeat this process
for {w/b}, {u/r}, {u/b}, {r/w}, {r/g}, {g/w}, {g/u}, {b/r}, and {b/g}.
The Guildpact unified Ravnica, and with that unity, strength and prosperity followed