Atarka Monument
Artifact
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or 
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: This artifact becomes a 4/4 red and green Dragon artifact creature with flying until end of turn.
Atarka is worshipped and fed by her subjects at Ayagor, the Dragon's Bowl.
Daniel Ljunggren
Rulings
If a Monument has any +1/+1 counters on it, those counters will remain on the permanent after it stops being a creature. Those counters will have no effect as long as the Monument isn't a creature, but they will apply again if the Monument later becomes a creature.
(wotc • 2015-02-25)
Activating the last ability of a Monument while it's already a creature will override any effects that set its power or toughness to a specific value. Effects that modify power or toughness without directly setting them to a specific value will continue to apply.
(wotc • 2015-02-25)
Each Monument is colorless, although the last ability will make each of them two colors until end of turn.
(wotc • 2015-02-25)
A Monument can't attack on the turn it enters the battlefield.
(wotc • 2015-02-25)
Rulings
If a Monument has any +1/+1 counters on it, those counters will remain on the permanent after it stops being a creature. Those counters will have no effect as long as the Monument isn't a creature, but they will apply again if the Monument later becomes a creature.
(wotc • 2015-02-25)
Activating the last ability of a Monument while it's already a creature will override any effects that set its power or toughness to a specific value. Effects that modify power or toughness without directly setting them to a specific value will continue to apply.
(wotc • 2015-02-25)
Each Monument is colorless, although the last ability will make each of them two colors until end of turn.
(wotc • 2015-02-25)
A Monument can't attack on the turn it enters the battlefield.
(wotc • 2015-02-25)