Different geographical areas will have different format preferences so some research is needed
At the beginning of combat on your turn, if youve drawn more than one card this turn, put X +1/+1 counters on target creature you control, where X is the number of cards youve drawn this turn minus one
Since Rootha only cares about the highest mana value each turn, cost reduction effects like Magnus are a godsend
There are also tons of typal-generic cards that can help your monks out until there's a more clear monk lord, so there are cards like Vanquisher's Banner and Adaptive Automaton
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It's a playable pump spell for many blue decks in Pioneer, Pauper, and Eternal formats