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Our Good Elder Dragon is the most powerful creature in Gruul with a board presence that dominates tables
This is a very slow spell - you don't want to be playing Stock Up on turn three when facing aggro - but later in the game it gives you really good access to the cards in your deck, making it perfect for controlling, spells-heavy decks
Even in the simplest of combat decks, green and blue can just attack and draw cards for attacking or damaging players hell, for even casting those creatures
Look for opening hands with cheap mana rocks like Sol Ring, Arcane Signet, or Mox Amber, alongside a source of card selection like Brainstorm or Gitaxian Probe
Modern Horizons 3 brought us Flare of Malice as the black free spell in the Flare cycle