Gateway to Chaos - Dimension of Chaos (DOCS)

When this card is activated: Add 1 "Black Luster Soldier" Ritual Monster or 1 "Gaia The Fierce Knight" monster from your Deck to your hand. Each time a Monster Card(s) is sent from the hand or field to the Graveyard, place 1 Spell Counter on this card for each of those cards (max. 6). Once per turn: You can remove 3 Spell Counters from this card; add 1 Ritual Spell Card from your Deck to your hand. You can only activate 1 "Gateway to Chaos" per turn.