Rampaging Baloths Another classic, I like Rampaging Baloths more than Avenger of Zendikar (though truth be told, I normally run both) because it has a higher floor
I think Im correct in saying that this is the cheapest (in terms of mana cost) one-sided card draw doubling effect we have now, so although it doesnt double your normal draw step, this is a no-brainer to slot into most blue decks
This can happen if you control a permanent, like Vorinclex, Monstrous Raider, that doubles the number of counters a permanent enters with
They were later reintroduced in Bloomburrow as simple occupations talents like fisher, builder, blacksmith, and the like, then again in Teenage Mutant Ninja Turtles to add depth to some of the main characters from that franchise