The most valuable Umbreon cards typically include 1st Edition holographic cards from early sets, Gold Star variants, Alt Art cards from modern sets, and promotional cards with limited distribution
If theres a solid two drop, like a 1/3 that Scries when you flash in your Gull, then getting extra value off of Vexing Gull is easy
Wrap Up Inspired Charge | Illustration by Willian Murai Magics Starter Kits are a great way to get newer players into the game
The Mardu have Mobilize, which lets cards create additional temporary 1/1 warriors, playing into other cards that rely on having extra creatures, while Sultai adds Renew, used from the graveyard to exile a creature entirely in exchange for granting bonus counters (including keyword counters like Lifelink or Deathtouch) to your cards in play
Its low cost makes it the perfect tool to handle aggressive decks that exploit cheap creatures or token producers like Gleeful Demolition