Once in play, a land can be tapped -- used up for that turn -- to generate a mana of that color, and mana is used to play the rest of the cards in your deck
Having anywhere between 22 and 24 lands is a solid choice
Turning damage into +1/+1 counters is the real build around here, however, and players are going to love hitting Anti-Venom with 100 damage from Dawnsire to create a truly superlative game-ender
There are tons of other fun cards in this set and some interesting Commanders to build around, but this list should make up some of the must haves for Commander players
Crew Shorikai with your tokens to turn it into an 8/8 attacker when needed
This is the main reason Veil of Summer is less relevant in Legacy as well its just not as good when counterspells are more mana efficient, as they can just cast another one to stop the Veil itself