Does Nevinyrral's disk destroy indestructible creatures?

Darksteel forge will make all your artifacts indestructable, therefore the destroy effect of nevinyrral's disk will not destroy them. With Lattice out all permanents are artifacts, so all your opponents permanents are destroyed.

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Does Darksteel Mutation get rid of counters?

The Mutation doesn't remove any counters from the creature. And when we apply power and toughness changing effects, we apply effects that set a creature's power and toughness (like the Mutation) before we apply bonuses from counters. Can you destroy Darksteel Mutation? The creature is indestructible and is not destroyed. At the same time, [[Darksteel Mutation]] is destroyed. By the time the Darksteel Mutation is destroyed, the effect that is destroying it has resolved. So, while the creature is no longer indestructible, it is still on the battlefield.

One may also ask do artifacts have summoning sickness?

Although all permanents experience Summoning Sickness, only Creatures, Artifact Creatures, Land Creatures, planeswalker creatures and Enchantment Creatures (or Land, Artifacts, planeswalkers or Enchantments that have become creatures) are affected by Summoning Sickness. Thereof, are lands colorless mtg? Although lands do count as permanents, they don't have a color. A card's color is defined by the symbols in the mana cost, and since lands have no mana cost, they are colorless. Lands can be given a color by other effects, such as Deathlace, but by default, they have no color.

Can a Planeswalker block?

No it can't. Planeswalkers can be attacked directly just like players, but only creatures can block. A Planeswalker isn't a creature. Only creatures can attack or block. You can also ask are lands spells mtg? Playing a land is a special action; it doesn't use the stack (see rule 116). Rather, the player simply puts the land onto the battlefield. Since the land doesn't go on the stack, it is never a spell, and players can't respond to it with instants or activated abilities.