Pokmons battles are instantly familiar to anyone whos played the video games
If a monster(s) is sent from the field to your opponent's GY: Place 1 Otoshidamashi Counter on this card, then Special Summon "Otoshidamashi Tokens" (Beast/EARTH/Level 1/ATK ?/DEF ?) up to the number of Otoshidamashi Counters on this card
C Common Nibiru, the Primal Being X LIGHT Level 11 [ RockEffect ] ATK 3000 DEF 600 During the Main Phase, if your opponent Normal or Special Summoned 5 or more monsters this turn (Quick Effect): You can Tribute as many face-up monsters on the field as possible, and if you do, Special Summon this card from your hand, then Special Summon 1 "Primal Being Token" (Rock/LIGHT/Level 11/ATK ?/DEF ?) to your opponent's field (this Token's ATK/DEF become the combined original ATK/DEF of the Tributed monsters)
Reveal 1 Fusion Monster from your Extra Deck, add 1 of the Fusion Materials listed on that card from your Deck to your hand, then you can add 1 "Polymerization" from your Graveyard to your hand
Many of these monsters are Rock Type, as some of them are part of a strategy of taking advantage of face-down, defense position Rock monsters
Once you reach that point, anything goes