When Fblthp enters, draw a card. If it entered from your library or was cast from your library, draw two cards instead.
When Fblthp becomes the target of a spell, shuffle Fblthp into its owner's library.
Fblthp is a mono-blue value engine: get it onto the battlefield repeatedly and bank cards, ideally by cheating it in from your library to draw two at a time. You grind out card advantage while leaning on blue's counterspells and tempo, then convert that surplus into a controlling lock or a big finisher. The protection clause (any spell targeting it just shuffles it away) means it dodges spot removal and lets you re-cast it endlessly.
Repeatable card advantage that snowballs hard in long games
Near-immune to targeted removal—opponents must use board wipes or edicts
Cheap commander that fits any blue strategy from control to combo
Loves blink, self-mill, and library-cast effects for the double-draw bonus
Mono-blue means no removal for resolved permanents beyond bounce/counters
Draws cards but doesn't directly close games—needs dedicated win conditions
Vulnerable to graveyard hate and to non-targeted sweepers/edicts
Can durdle and fall behind explosive multiplayer boards