When companions were initially introduced in Ikoria: Lair of Behemoths, players could cast them directly from the companion zone, but a subsequent update added a three-mana tax to add it to your hand first, making it less desirable to fulfill the stipulation
First, I should detail a little bit how the Lugia / Archeops matchup goes
MAGICS PRIME REAL ESTATE (HONORABLE MENTIONS) That being said, there is a tiny group of honorable mentions that would, by their equivalent market value and scarcity, make up the shortlist for any such expanded Power set
Sure, each half costs one mana more than the split half, but you can add in interaction in your creature spots or a creature in your interaction slot and then a beater later to close out the game, and you can get both effects for one card
You can surprise your opponents flying army with two 7/7 Cloudthreshers with flash and reach, dealing 4 damage to all fliers
Doubling your mana at such a lower cost lets this deck seize an early lead and drown the table beneath massive monsters before they have a chance to react