mtg what are serialized cards I've opened an average of

This deck is a turbo list first and foremost and runs incredibly low to the ground with an average mana value under 1.5

Its not the worst, but its far from the best version of this effect

Since it can hit the battlefield so early in a game, you can start unlocking rooms quickly, which normally requires a high mana investment to open with Marina

You can activate Dream Trawler's last ability even if it's already tapped

Demonic Pact Demonic Pact sees some play in formats like Pioneer to get some card advantage, and you can blink it to avoid the downside, or even sacrifice it to a card like Beseech the Mirror

Call to the Kindred seems like the perfect fit for a deck like this provided you can make it around to your next turn with it still enchanting one of your Slivers