Megalith Anastasis - Doom of Dimensions (DOOD)

You can discard 1 card; add 2 "Megalith" monsters (1 Level 4 or lower and 1 Level 8 or higher) from your Deck to your hand. You can only use this effect of "Megalith Anastasis" once per turn. Once per turn, if you Ritual Summon a "Megalith" monster (except during the Damage Step): You can activate 1 of these effects (but you can only use each of these effects of "Megalith Anastasis" once per turn);
• Draw 2 cards, then discard 1 card.
• Tribute 1 monster your opponent controls.