Koth, the Geomancer

: Koth, the Geomancer enters the battlefield with X additional loyalty counters, where X is equal to the number of mountains you control
+2: Search your library or graveyard for a mountain card, put it onto the battlefield under your control
-X: Put X 2/2 red Elemental tokens with haste and "Sacrifice this creature, deal one damage to target player" onto the battlefield