The full contents are 4 cards with art from the 1978 animated classic in foil and non-foil
Several factors influence HeartGold & SoulSilver card values: card condition (mint cards worth 3-5x more), rarity (holographic and rare cards command higher prices), first edition status, PSA/BGS grading scores, and market demand for specific Pokemon
If a player controls only one creature as the ability resolves, they must sacrifice it
He also has other highly useful abilities for any prowess-themed deck.
To work that out, we're using TCGPlayer's market pricing for cards from Shining Fates (including its Shiny Vault), Battle Styles, Chilling Reign, Evolving Skies, Fusion Strike, Celebrations (and the Classic Collection), the McDonald's 25th Anniversary promos, and the First Partner Pack cards
Blue looks at white and sees a fellow color that understands the need to plan and look ahead