Make sure that you activate as many as you can before you activate the Overseer with as much mana as youre willing to spend, even if they arent attacking
Lyra's a 5/5 Legendary Angel with Flying, First Strike, Lifelink for
If you remove their Turn 1 White Plume Adventurer with a Swords to Plowshares, the Initiative mechanic keeps on rolling unless you have a way to steal it back via combat damage
Swapping out Gadrak, The Crown-Scourge is an easy one since even though the big red Dragon costs only three mana, he cant do anything on his own
Cards that can more easily help fill in gaps for tribes that might not have the same degree of support others do

MAGIC MEETS THE LORD OF THE RINGSExperience the beloved story of The Lord of the Rings with the strategic gameplay of Magic: The Gathering, facing off against opponents in thrilling magical battles EPIC MULTIPLAYER BATTLESCommander is a multiplayer way to play Magic, an epic, free-for-all battle full of strategic plays and social intrigue ELVEN COUNCILJoin the elven council with a 100-card Green-Blue deck containing 2 Foil Legendary Creature cards and 98 nonfoil cards INTRODUCES 20 COMMANDER CARDSThis deck introduces 20 never-before-seen Commander cards to Magic: The Gathering COLLECT SPECIAL TREATMENT CARDSEach deck comes with a 2-card Collector Booster Sample Pack containing 2 special treatment cards from The Lord of the Rings: Tales of Middle-earth set, including 1 Rare or Mythic Rare and at least 1 Traditional Foil For Competitive EDH I wouldnt take any of these precons to a competitive table right out of the box