Unmitigated ramp at instant speed is interesting, and the removal options are all useful in different scenarios
Being a 4-mana 1/1 is rough, but it can grow every turn and the potential for doubling gigantic spells/creatures is huge
Damnation Damnation is Wrath of God in black, and the ability to destroy all creatures for 4 mana is precious in decks like Dimir control since you dont need to splash white for this effect
But while Invasion began with several novel ideas that have stood the test of time, the biggest innovation didnt arrive until the conclusion of the block with Apocalypse
These are problematic because in the future, if the owner wants to sell their Commander and forgets that there was a "proxy" of an old dual, or if family members intend to sell them, or even if the owner dies, this "proxy" card can end up in the hands of people who don't play Magic, and many times these people can try to sell fake cards unintentionally