Whether its copying your own or someone elses, Dualcaster Mage (which is one of the reprints) will do even more heavy lifting
One of the best options is Acolyte of Bahamut, which lets you discount Dragon spells since Dragons have a lot of attack triggers and Karlach provides extra combat steps
I doubt youll get much mileage out of it since your opponents wont attack
Since he essentially gains +3/+3 each time he takes damage, and gives you three rad counters at the same time, any repeatable ping effect can grow Strong to obscene proportions and Mill your entire deck, opening the doors for a Thassas Oracle win the next turn
To wit: A Final Fantasy collector booster currently sells for over $120 at tgcplayer.com, and a collector box goes for over $1,300
Maybe you might want Rhinos or Apes or something but there's only so much space