Commander 2018

Artifact spells you cast cost {1} less to cast.

(Seat of the Synod isn't a spell.) {T}: Add {U}.

Bojuka Bog enters the battlefield tapped. When Bojuka Bog enters the battlefield, exile all cards from target player's graveyard. {T}: Add {B}.

Look at the top three cards of your library, then put them back in any order. You may shuffle your library. Draw a card.

{1}, {T}: Add {U}{R}.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle your library. Threshold — If seven or more cards...

Flying

({T}: Add {W}.)

{T}: Add one mana of any color in your commander's color identity.

({T}: Add {U}.)

Search your library for up to two basic land cards, reveal those cards, and put one onto the battlefield tapped and the other into your hand. Then ...

Khalni Garden enters the battlefield tapped. When Khalni Garden enters the battlefield, create a 0/1 green Plant creature token. {T}: Add {G}.

Defender When this creature dies, create a 2/2 red Dragon creature token with flying and "{R}: This creature gets +1/+0 until end of turn."

({T}: Add {R}.)

Sacrifice Sakura-Tribe Elder: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle your library.

Ninjutsu {1}{U} ({1}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)...

({T}: Add {U}.)

Trample