In comparison to Legacy which is a more stack-oriented format, Modern decks are mostly filled to the brim with answers to creatures, some even being devastatingly good against Ragavan, Nimble Pilferer, as is the case with Wrenn and Six
Just hope you can use the mana better than your opponents
Collective Inferno Damage doublers get especially dangerous when they empower noncombat damage like with bite spells or pingers
I give Rona 9 Phyrexian invasions out of 10
Starting at the very beginning with Base Set Charizard, which still retains an eminently high value on the secondary market especially for its first edition and shadowless variants Charizard cards have long been incredibly popular and hugely valuable for collectors and fans alike
There are also a bunch more good spell copiers to consider, ranging from Fork to Ral, Storm Conduit