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3 Guide Books(3 types)

Now read the flavor text

Between these two categories, Krenko, Mob Boss allows you to build an incredibly powerful gamestate incredibly quickly

Both themes are generally not recommended because they are far from practicality

(2) If this card is sent to the GY by an effect, or destroyed by battle: You can add 1 Level 8 Rock monster from your Deck to your hand, or, if Fossil Fusion is in your GY, you can Special Summon it from your Deck instead, but if you do either, for the rest of this turn, you cannot activate the effects of cards with that added/Summoned cards name.

While it seems to be currently not very popular in Standard, many players currently seem to be experimenting with it