Paldean Student lets you search your deck for a Pokemon card that doesnt have a rules box, so no ex, V, or Tera Pokemon, and then add it to your hand
You see, Painful Truths can act just like Ancient Craving for one less mana, as long as you spend black and 2 other colors on it
All promo cards are limited, so you must keep an eye out for the latest promotions if you want to get a copy yourself
Vensers Journal is probably the most impactful of these colorless hand size changers, due to the massive lifegain over the course of those long-drawn-out EDH games, and is often found in control decks
You'll also get punchout counters to keep track of creature buffs, 10 double-sided tokens to represent creatures and other things created by your cards' abilities and a deck box to store it all in