Keen-eyed brewers will note that these abilities, as well as Flubs' built-in extra-land-drop ability, point to Flubs being a commander with a particularly high power ceiling when built effectively
though if youre enthusiastic about the gameplan then you will definitely want to add a few more of these effects to ensure consistent access
Audacious SwapAudacious Swap is a more expensive, worse Chaos WarpChaos Warp that you can do twice if you sacrifice a creature, but does say "cast" instead of "put onto the battlefield", and therefore allows you to try and get a couple bites at the apple
Open the decklist template, either digitally or in print
(If it annoys you that Pact of Negation can target creature spells when Negate and Force cannot, I sympathize Pact unfortunately predates Negate, which messes up this neat bit of Magic taxonomy.) Force of Negation is effectively a compromise with players who begged for free counterspells to hamper the ultra-aggressive combo decks in Modern