I'm lost, do you mean that she can only wish for cards that are banned in the format you're currently playing?
Never mind, once again he was answering a Blogatog question poorly because he doesn't understand Commander. She works as intended, only in Commander "as intended" means:
OK, in all seriousness, if your playgroup allows for the 10 card sideboard rule, then you can fit in 10 Black/Colorless/Lands cards. These still need to be legal in current Commander format, and still need to meet the requirements of your Commander colors, so in Spikes case only Black and Colorless. You can only have 1 of each card for both deck + sideboard.
Note, you will need to wait until the next opponents upkeep, because Yawgmoth's Will exiles cards that go to graveyard, so the Mike + Trike will need to wait, no big deal.
how'd you get rid of spike?
Never mind, once again he was answering a Blogatog question poorly because he doesn't understand Commander. She works as intended, only in Commander "as intended" means:
: Do nothing
Misc. EDH Stuff: Commander Cube | Zombies (Horde)
Resources:Commander Rulings FAQ | Commander Deckbuilding Guide
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So what cards are available?
This list only reflects the current ban/restricted list, so hunting for those that were banned, will also be a major factor.
Here is a possible two turn win condition. Lets say you've already spent 4 life to get out Spike:
8 life per card x 4 = 32 life. These are some of your sideboard cards:
So you can spend 32 life to get (Lion's Eye Diamond, Mana Crypt, Sol Ring, Mirror Universe) and cast these cards. You'll need to pass the turn.
Then in your next turn upkeep swap life totals.
Demonic Tutor B1 for Buried Alive B2 putting Mikaeus, the Unhallowed and Triskelion into graveyard.
Cast Yawgmoth's Will B2
Recast Lion's Eye Diamond (from Yawgmoth's Will)
Demonic Tutor B1 again for Victimize (from Yawgmoth's Will)
Cast Victimize B2 sacrificing Spike, Tournament Grinder
Note, you will need to wait until the next opponents upkeep, because Yawgmoth's Will exiles cards that go to graveyard, so the Mike + Trike will need to wait, no big deal.
Niv-Mizzet Reborn
Feather, the Redeemed
Estrid, the Masked
Teshar
Tymna/Ravos
Najeela, Blade-Blossom
Firesong & Sunspeaker
Zur the Enchanter
Lazav, the Multifarious
Ishai+Reyhan
Click images for decks->
-Prime Speaker Vannifar
---------------------Will & Rowan Kenrith
Niv-Mizzet Reborn
Feather, the Redeemed
Estrid, the Masked
Teshar
Tymna/Ravos
Najeela, Blade-Blossom
Firesong & Sunspeaker
Zur the Enchanter
Lazav, the Multifarious
Ishai+Reyhan
Click images for decks->
-Prime Speaker Vannifar
---------------------Will & Rowan Kenrith