A Marnie CSR from S4a Shiny Star V has traded at $150+ for years because Marnie is a franchise-favorite character, while lesser-known CHRs can stay at $5$10 for the long term
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anything that starts the game already benefitting you is sure to become a pain for your opponents before long, and turtling up around Oloros passive ability while its still in the command zone is a surefire way to become untouchable for the rest of the game
Tormod, the Desecrator is the classic pairing to generate board presence with your card advantage, but you could also try Glacian, Powerstone Engineer to facilitate the self-mill or Tymna the Weaver for even more cards
Gandalf the Grey is the quintessential fantasy wizard, so it made sense for his card design to be blue-red as those are the colors that do the most wizardy things in-game
Naturally, you choose to have it come first and the creature is safely in your hand when the damaging spell takes effect