Pokmon started as something simple: trading cards on the playground, Game Boys passed around between friends and the dream of catching 'em all
You can obtain the Mewtwo ex (2-Stars rarity) card by opening Genetic Apex: Mewtwo from Genetic Apex set
The hopelessness and helplessness of relying on a single drawn card to turn your game around is enough to ensure that most Commander decks have some sort of mechanic to refill their hand with as many cards as possible
In order to grab all the cards in the game we're going to break them down by the number of unique cards, so no reprints or variants, and then the total number of all cards ever printed
Tims Zuran Spellcaster (Ice Age/Alliances) , Suq'Ata Firewalker (Mirage/Visions/Weatherlight) , Rootwater Hunter (Tempest/Stronghold/Exodus) , Thornwind Faeries (Saga/Legacy/Destiny) , Stinging Barrier (Masques/Nemesis/Prophecy) Psionic Gift and Hermetic Study are fine, but they require a two card investment: the creature you are enchanting, and the enchantment itself
Loyalty counters on planeswalkers and lore counters on sagas are two prime examples