Ekko, Dimension Explorer

Flash, Protection from Black

Landfall - Whenever a Basic land enters the battlefield under your control, sacrifice it, then search your library for an Arcane land of the same type as the sacrificed land and put it onto your battlefield.

Other Creature Spells you cast have Affinity to Arcane lands: (This spell costs {1} less to cast for every Arcane land you control.)

Partner with Heimerdinger