Lavaclaw Reaches enters tapped. : Add or . : Until end of turn, Lavaclaw Reaches becomes a 2/2 black and red Elemental creature with “: This creature gets +X/+0 until end of turn.” It’s still a land.
When 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.
01-03-2010
wotc
A land that becomes a creature may be affected by "summoning sickness." You can't attack with it or use any of its {T} 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.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.