Swamp

Patriar's Seal

{T}: Add one mana of any color.
{1}, {T}: Untap target legendary creature you control.

Endrek Sahr, Master Breeder

Whenever you cast a creature spell, create X 1/1 black Thrull creature tokens, where X is that spell's mana value.
When you control seven or more Thrulls, sacrifice Endrek Sahr, Master Breeder.

Reassembling Skeleton

{1}{B}: Return this card from your graveyard to the battlefield tapped.

Resourceful Return

Return target creature card from your graveyard to your hand. If you control an artifact, draw a card.