Arena's going into open beta on the 27th. Now's as good a time as any to waste coins/wildcards on derpy experimental decks since they and all card collections will be wiped at the end of closed, the exception being any purchased coins/gems.
On a side note, I've found that the enchantment Induced Amnesia is a great addition to a mill deck running Psychic Corrosion since it allows me to target myself to exile my hand and draw cards equal to the cards I exiled; a good sized hand can clear out a chunk of the opponent's library thanks to PC. I also include some Blink of an Eye in my deck so I can bounce the IA back into my hand to reuse it.
3 DAYS LATER EDIT:
Speaking of fun derp decks before the wipe, I put together a rather wild artifact-centric deck with some of the more gimmicky artifacts from Core 2019, i.e. Chaos Wand and Transmorgrifying Wand. CW lets me play opponent's instants/sorcery from their deck and TW lets me replace their creatures with derpy-looking 2/4 Oxen. The deck also includes some planeswalkers to build board presence/draw cards, some Timestream Navigators to give me some extra turns (great for putting away matches), and some heavy hitters like Planar Bridge, Skysovereign, and Cataclysmic Gearhulk. Deck's main weakness is that it cannot afford to fall behind on lands early.
1 Gleaming Barrier
3 Timestream Navigator
2 Jhoira's Familiar
2 Aven Wind Guide
2 Aerial Engineer
2 Traxos, Scourge of Kroog
1 Cataclysmic Gearhulk
1 Fountain of Renewal
1 Sentinel Totem
2 Prophetic Prism
2 Servo Schematic
3 Servo Exhibition
2 Chaos Wand
4 Powerstone Shard
1 Transmorgrifying Wand
1 Dovin Baan
1 Karn, Scion of Urza
1 Sram's Expertise
1 Skysovereign, Consul Flagship
2 Tezzeret, Artifice Master
1 Planar Bridge
1 Glacial Fortress
1 Inventors' Fair
2 Zhalfirin Void
10 Island
10 Plains