Flying, vigilance
Radiant gets +1/+1 for each other creature on the battlefield with flying.

Flying, protection from black
Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, return target creature card from your graveyard to the battlefield.

, Sacrifice this artifact: Each player exiles all cards from their hand face down and draws seven cards. At the beginning of the next end step, each player discards their hand and returns to their hand each card they exiled this way.

Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
: Draw a card.

Beast of Burden's power and toughness are each equal to the number of creatures on the battlefield.

Shroud (This creature can't be the target of spells or abilities.)
Multani's power and toughness are each equal to the total number of cards in all players' hands.

Flying
When this creature dies, return it to its owner's hand.

Flying
When this creature enters, untap up to seven lands.
: Return this creature to its owner's hand.