For example, if you gained 3 life and lost 3 life earlier in the turn, you'll create three tapped 3/3 green Treefolk creature tokens, then put a reach counter on each of them
If you play a lot of constructed Commander, these decks arent any more complicated than player constructed decks, but theres a lot of triggered/activated abilities, +1/+1 counters, and various mechanics from all over Magic inside them
Along with Prismatic Ending it represents the pinnacle of white removal in Modern, pushing Path to Exile a few ranks down the ladder and even out of our Top 5
However, this version of Mickey was also used in a lot of promotional materials for the game, which may also have made it more desirable
#IzzetProblems
If the total mana value of historic permanents you control changes while activating mana abilities (probably because you sacrificed one or more historic permanents), the cost to cast Excalibur remains what you previously determined