Thundering Raiju, which dishes out +1/+1 counters as well as damage
Im not even sure how much of a joke that is, since Shadow is sometimes even better than that
In the Vivid Voltage set, there is a Cramorant card that can do 60 damage multiplied by how many Arrokuda cards are discarded from the bench
Cards from 'The First Chapter', 'Rise of the Floodborne', 'Into the Inklands', and 'Ursula's Return' are not legal in the game's Core Constructed format, except when the card has been reprinted in a later set
Pairing it with something like Font of Agonies turns all that life-payment into a steady stream of removal, and it has a great baseline of doubling up on fetch land activations
Built with red and white, Arcees focus is placing and using +1/+1 counters whenever she is targeted by spells from any player