Shadowmage Infiltrator, like Psychatog is not the card he once was
These cards are insanely powerful, but they need entire decks to be dedicated around them, and many aren't worth it due to just how much support they need
For folks uninterested in battling, there is an auto-battle feature that lets an AI play for you just to get experience, but its not an instant win
Rhyhorn is not a starter Pokmon nor is it a legendary, but its evolution into Rhydon and then Rhyperior (with the advent of the Protector item introduced in Generation IV) gives it a unique evolutionary line that enhances its competitive viability
The Moloch seems weakest to me (if only because card advantage has become so cheap), but being able to flash it in and pick off an unguarded Planeswalker might give it enough utility
Throw in the transformation to Sephiroth, One-Winged Angel that provides a substantial sacrifice outlet/mass draw effect, and you have a nasty threat that might not break any creative metrics, but serves as the solid foundation from which to build your 99