Arbor Colossus

two generic mana one green mana Creature — GiantPower and toughness6/6

Reach

three generic mana one green mana : Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.)

When this creature becomes monstrous, destroy target creature with flying an opponent controls.

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0.16 $

Foil 0.50 $

18 printings · up to 0.17 $

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Arbor Colossus rulings

2013-09-15
Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.
2013-09-15
Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.
2013-09-15
An ability that triggers when a creature becomes monstrous won't trigger if that creature isn't on the battlefield when its monstrosity ability resolves.

Arbor Colossus keyword rules

Reach Rule 702.17

Reach is a static ability.

A creature with flying can’t be blocked except by creatures with flying and/or reach. (See rule , “Declare Blockers Step,” and rule , “Flying.”)

Multiple instances of reach on the same creature are redundant.

Monstrosity Rule 701.31

“Monstrosity N” means “If this permanent isn’t monstrous, put N +1/+1 counters on it and it becomes monstrous.”

Monstrous is a designation that has no rules meaning other than to act as a marker that the monstrosity action and other spells and abilities can identify. Only permanents can be or become monstrous. Once a permanent becomes monstrous, it stays monstrous until it leaves the battlefield. Monstrous is neither an ability nor part of the permanent’s copiable values.

If a permanent’s ability instructs a player to “monstrosity X,” other abilities of that permanent may also refer to X. The value of X in those abilities is equal to the value of X as that permanent became monstrous.