pokemon riolu card POKÉMON GAME S9 054/100 C Weakness Psychic ×2 Resistance None None Retreat Cost Pokémon Riolu Promo Holo Card

All of that to say, more colour-intense mana costs have more of a role to play in card design than just to indicate a card's relative power, although it is fun when WotC does print a particular card as a strong payoff for really dedicating your deck towards a particular colour

How can you get the best out of them

Scry 2 is more than twice as good as scry 1 and just exactly what you want to be doing as a control player

For some sets, both can still be found without too much trouble, despite unlimited edition having a shorter print run, like most sets in the EX and DP eras for example

Other effects might let you look at a set number of cards and put one into your hand