The upkeep cost of just one blue mana is trivial to pay
The problem is that they can more easily play multiple bombs in a turn than can be answered thanks to their mana advantage
Avenger of Zendikar The many plant tokens created by Avenger of Zendikar start off small, but they only get bigger with +1/+1 counters for each land that enters
36 Innistrad: Midnight Hunt MTG Draft Boosters 15 MTG cards per Draft Booster 2 double-faced cards in every booster 1 Eternal Night full-art basic land in every pack Become what you fear in a gothic horror set overrun with werewolves, warlocks, and spooky mechanics March of the Machine The general card quality in March of the Machine draft boosters is quite good with a very strong top end of cards that include the likes of Breach the Multiverse, Etali, Primal Conqueror, Tribute to the World Tree, and power couples on legends like Ghalta and Mavren and Drana and Linvala
The generated tokens do a decent job protecting this card, the downtick is acceptable protection, and both fuel an ultimate that can easily win the game