If myriad creates more than one token for any given player (due to an effect such as the one Doubling Season creates), you may choose separately for each token whether it's attacking the player or a planeswalker they control
For example, Zirda may be in your starting deck even if your other permanent cards don't all have activated abilities
Speaking of which, Selfless Spirit is a two-mana White 2/1 with flying that you can sacrifice to give all your creatures indestructible until the end of the turn
Your opponent can respond to the ability or spell afterward, but the creature you sacrificed is already in the graveyard
Just pack plenty of basics
In just the past four months, they managed to add holograms, start counterfeiting foil cards, and increase the number of cards they offer by more than 300%