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
11 Falco Spara, Pactweaver Why Not Make Your Deck Your Hand
To me, it seems quite out of place in red/green, especially with the self-mill plan being green/black
Also worth knowing More archetypes you'll meet These show up regularly
Proxy cards are not allowed generally but in certain conditions, it is allowed to include a proxy card in the deck of a player for a specific game by the judges making it an official proxy
They had different backs and still arent legal for tournament play, but everyone I know who has these uses them for Cube or Commander