The sweet spot is probably around 5 mana so that you can have two creatures that give your tokens +1/+1 counters, but you can really sink as much mana as you want into that squad ability
#2 Tishanas Tidebinder Tishanas Tidebinder is one of the few cards on this list with significant potential in Modern
6 Grand Architect Grand Architect is another blue mana generator that specializes in colorless mana, and this mana can only be spent on artifacts and artifact abilities
Sleepy comes into play exerted because hes so sleepy, and when Dopey gets banished, the rest of the Dwarfs go into a blood rage and gain +2 strength to avenge him
You can use it to save stuff from mass removal or targeted, protect something post-bounce, and a lot more
Even if each opponent only has one artifact or enchantment out, by the time you play this, you will be up three mana, and jump from turn three to turn six