Ghru Elder

Ghru Elder is all colors. This ability doesn't
affect its color identity.
Multicolored spells you cast have convoke. (Your creatures can help cast those spells. Each creature you
tap while casting a multicolored spell pays for {1} or
one mana of a colour that creature is.)
"Stay away from Farron Keep, the risk is not worth
the reward." Hollowed Coward.