Previewed cards include both fan favourites and Commander staples in need of a reprint, and all five Mana colours have received at least one bit of representation
The first of these decks revealed was Tyranid Swarm , based on Warhammers Sliver-like horde of all-consuming monstrosities
Paying 6 mana over two turns to turn The Ur-Dragon indestructible seems okay, but the deck doesn't have much room for colorless lands, so I don't think I'd want to include something of that nature in the deck unless you really want your creatures to be indestructable
Although the size distinction between Jumbo XL and Jumbo L is delicate, it is considerable when choosing protective accessories
The most common choices are either spells that affect two different permanent types or ones that hit a permanent type, most usually a creature, and a player
Weve written a separate article on that, which you can read here