Lavaclaw Reaches
Land
Regeltext
This land enters tapped.
: Add 
or 
.
: Until end of turn, this land becomes a 2/2 black and red Elemental creature with "
: This creature gets +X/+0 until end of turn." It's still a land.
Rulings (2)
Offizielle Rulings sind nur auf Englisch verfügbar.
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Wizards of the CoastWhen a land becomes a creature, that doesn't count as having a creature enter. The permanent was already on the battlefield; it only changed its types. Abilities that trigger whenever a creature enters won't trigger.
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Wizards of the CoastA land that becomes a creature may be affected by "summoning sickness." You can'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.