You can't look at face-down permanents you don't control unless an effect instructs you to do so
That difficulty only becomes a greater burden as you add more colors, but by using lands with basic land types, you can mitigate this problem by making use of helpers like Polluted Delta, Skyshroud Claim, and Knight of the White Orchid to find them and put them onto the battlefield quickly
My examples here are a playtest card that is not for Constructed play, a Commander format-specific card, and a superpowerful card translated from Arena's Alchemy to paper
Card Name Mana Cost Type Creature Demon Rarity Mythic Rare rules Text FlyingWhen this creature enters, destroy target non-Demon creature.At the beginning of your upkeep, if there are fewer than six creature cards in your graveyard, sacrifice a creature
Machamp ex takes 20 additional damage from Psychic-type attacks
Spiritomb Basic HP 80 Spiritomb is a Basic darkness card from Pokmon TCG Pocket
