We don't control what specific cards players get, but we can control the play environment
Repeated resurrection of huge threats like Avacyn, Angel of Hope, Kokusho, the Evening Star, or Vorinclex, Voice of Hunger for a mere 3 mana is simply more than many pods can bear
Not properly packaging the cards
That can sacrifice any portion of your board for card draw and extra life drain pings
Cards like these dont always see competitive play, but they also typically pay for their high-tempo potential with negligible impact in the late game
Misleading Signpost A mana rock version of Portal Mage, this card can easily slot into any deck that plays Blue and be excellent against anything other than a token swarm (and even then it might make all the difference)