Frodo, Adventurous Hobbit // Sam, Loyal Attendant is built around Forest, Swamp, Plains, Arcane Signet, Academy Manufactor, Scurry Oak, Chatterfang, Squirrel General, Prosperous Innkeeper, Necroblossom Snarl
When the rules are based on what cards you play rather than how the deck actually performs , clever deckbuilders will always find ways to min/max around the restrictions
Elesh Norn's second and third ability each affects a permanent's own enters-the-battlefield triggered abilities as well as other triggered abilities that trigger when that permanent enters the battlefield
Ancestral Recall became a defining card in early MTG sets, allowing players to draw three cards for just one blue manaan effect so powerful that it remains restricted in competitive play
Epic, hyped chase cards like the Umbreon ex SIR soared to dramatically high prices, reaching as high as $1600 upon initial release
It deals a high amount of damage for just a few energies, and has been great in tournaments