Thanks to Lurrus of the Dream Den, you can cast all of your spells, use Lion's Eye Diamond to make three mana, use that mana to cast Lurrus of the Dream Den as your companion, and immediately recast Lion's Eye Diamond thanks to Lurrus's static ability, which means the floor of Lurrus in a deck like ANT is upping the storm count by two, which is probably enough for Lurrus to steal a sideboard slot all by itself
Incapsula incident ID: 562000120611340026-1630742594918155062
Gravespawn Sovereign hadnt even had a new border printing
The first, Frigid Fluttering, allows you to search your deck for two Basic Water Energy cards, attaching them to Articuno and then shuffling
Going from smallest kid on the block to biggest hero in the city will also earn you an extra card
Karns Temporal Sundering Karn's Temporal Sundering might be my favorite extra turn spell for Cube