It could even work for control decks that can use the flip side, Caetus, Sea Tyrant of Segovia to help keep mana open for counterspells
Well, luckily this one is one of the easiest to find budget upgrades for because several great ones exist
Even so, this effect is a very strong game closer, and I would say with the pass of time and new cards being printed it is inevitable that we will get more ways of accelerating/cheating this into play and winning on the spot

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Landbase Steiner doesnt require much in the way of utility lands, Rogues Passage and Buried Ruin being the most important
The Secret Lair is called Ghostbusters: Slimer and includes five different cards, unsurprisingly focused on the weird but lovable green ball of slime himself