And for anyone not familiar with the news of the London Mulligan, heres how it works (taken from the official WotC announcement): When you mulligan for the Nth time, you draw seven cards, then put N cards on the bottom of your library in any order.
Tivash, Gloom Summoner is a lifegain commander that makes demon tokens too, but you dont have enough access to red
4/4 Rabanasta, City of the Kingdom Rabanasta, City of the Kingdom Land - City This land enters tapped
I suspect the ability forcing you to sacrifice lands would be seen as a drawback, meriting the mana cost reduction
Llanowar Elves/Fyndhorn Elves/Elvish Mystic No best Elf cards list would be complete without the one that started it all: Llanowar Elves, originally printed in Alpha , is perhaps the card thats most synonymous with this creature type
For example, Churchill and co say the leading formal theory of games assumes that any game must be computable