Some card effects affect your ability to play lands
Spirit Water Revival, from Avatar: The Last Airbender , has a huge ceiling: you reshuffle your graveyard, draw a huge amount of cards (nine in total!), and on top of that you get the effect that gets Spirit Water Revival into this ranking: no maximum hand size
Flatline Flatline has a nice potential of being a fog for 3 mana, a huge combat blowout, or even a two-card sweeper in decks that have the potential to deal 1-2 damage to every creature
Appearing as a promo card in two sizes, Pikachu VMAX generates Energy with Tail Charge, then lets loose with a huge G-Max Thunder attack
(Thanks to @KingPokemon for the picture of an Uncommon Jungle Sheet and stating there were 7 Butterfrees on a single sheet.) Other Languages Here is also an overview of 1st edition print runs for other languages, excluding the English print runs which we covered above, and the Japanese print runs which well cover in a moment: German (EDITION): Base Set