Ornithopter

Silver Myr

This land enters tapped.
Indestructible
{T}: Add {W} or {U}.

Artifact spells you cast cost {1} less to cast.

Artifact creatures you control get +2/+2.

Enchant creature
Enchanted creature gets +1/+1 for each artifact and/or enchantment you control.

({B/P} can be paid with either {B} or 2 life.)
Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Target creature gets +2/+2 until end of turn.
Metalcraft — That creature gets +4/+4 until end of turn instead if you control three or more artifacts.

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.