Seedborn Muse and Vedalken Orrery are already annoying to play against because of how powerful they are, and Prophet of Kruphix combines those effects into one card
Milling had definitely been established as part of artifacts' slice of the color pie (more on this in a bit), so Mirrodin was an excellent block to put more milling artifacts in
Other death trigger cards that are highly valuable are Thornbite Staff, Fecundity, Vein Ripper, Sephiroth, Fabled SOLDIER / Sephiroth, One-Winged Angel, and Black Market
Storm (When you cast this spell, copy it for each spell cast before it this turn.) You can play the exiled card only on your next turn after Galvanic Relay resolves
While the game is a treat for Final Fantasy fans, and the gameplay is engaging, it does leave a bit to be desired from an aesthetic standpoint, as many cards simply feature characters on a blank background
Use the cantrips to set up your early turns (and occasionally plan out a timely Miracle Temporal Mastery), Spreading Seas to slow them down, hopefully flash in Dictate of Kruphix on their end step, untap and hold up Cryptic Command or Gigadrowse, and then cast Time Warp on Turn 5 and never pass the turn back to them