When a land becomes a creature, that doesnâ€™t count as having a creature enter the battlefield. The permanent was already on the battlefield; it only changed its types. Abilities that trigger whenever a creature enters the battlefield wonâ€™t trigger.
This land is colorless until the last ability gives it colors.
An ability that turns a land into a creature also sets that creatureâ€™s power and toughness. If the land was already a creature (for example, if it was the target of a spell with awaken), this will overwrite the previous effect that set its power and toughness. Effects that modify its power or toughness will continue to apply no matter when they started to take effect. The same is true for counters that change its power or toughness (such as +1/+1 counters) and effects that switch its power and toughness. For example, if Hissing Quagmire has been made a 0/0 creature with three +1/+1 counters on it, activating its last ability will turn it into a 5/5 creature thatâ€™s still a land.
A land that becomes a creature may be affected by â€œsummoning sickness.â€ You canâ€™t attack with it or use any of its abilities (including its mana abilities) unless it began your most recent turn on the battlefield under your control. Note that summoning sickness cares about when that permanent came under your control, not when it became a creature nor when it entered the battlefield.
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