First of all, you can pull it off as early as turn four
These 8 Calamity Beasts7 mythic rares and 1 rareare a threat to Valley, so it's best to stay informed
Planeshift , the next set in the Invasion block, had 16 cards with kicker that introduced variations to the kicker cost, allowing you to pay life and sacrifice lands, and some spells like Nightscape Battlemage had multiple kicker costs
Your opponent getting 1000 LP in order to summon back what will most likely be a Tuner monster seems balanced enough, and even if this monster is a 2K level 4, you will most likely use it go into something like Rosemary, or even Alraune
Surfing Pikachu VMAX #9 Pokemon Celebrations Keep track of your collection value over time
(Since the Paradox Engine got banned, I'm using Intruder Alarm instead.) Actually with Basal Sliver + one mana generation sliver + haste I don't even need to reduce the cost of Sliver Queen *oversized* ability