You can cast Spike in any deck with the Phyrexian mana option, and then use that mana to use her in any other formats
This will see play in both Standard and Modern formats, and is going to be on the level of Karn, Scion of Urza that proved to be an excellent planeswalker from Dominaria
Its an okay benefit, but Id like more out of my commander especially if Im limiting myself to making a mono-white deck for it
When casting the adventure portion, it only has the characteristics of the adventure spell
Indestructible is great, but not always
However, if an artifact or enchantment is destroyed but doesnt go to its owners graveyard due to a replacement effect (like the one Rest in Peace creates), it will count.