When Sterling Hound enters the battlefield, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

When Stone Retrieval Unit enters the battlefield, create a tapped Powerstone token. (Its an artifact with ??TAP: Add (c). This mana cant be spent to cast a nonartifact spell.??)

Stonework Packbeast is also a Cleric, Rogue, Warrior, and Wizard.

2: Add one mana of any color.

Equipped creature gets +1/+1 and has haste.

Equip 1 (1: Attach to target creature you control. Equip only as a sorcery.)

2: Stuffed Bear becomes a 4/4 green Bear artifact creature until end of turn.

TAP: Add B, G, or U to your mana pool.

BGU, TAP, Sacrifice Sultai Banner: Draw a card.

Sunburst (This enters the battlefield with a +1/+1 counter on it for each color of mana spent to cast it.)

Flash

When Supply Drop enters the battlefield, target creature you control gets +2/+2 until end of turn.

4, TAP, Sacrifice Supply Drop: Draw a card.

Surge Node enters the battlefield with six charge counters on it.

1, TAP, Remove a charge counter from Surge Node: Put a charge counter on target artifact.

1, Sacrifice Surgical Skullbomb: Draw a card.

2U, Sacrifice Surgical Skullbomb: Return target creature to its owners hand. Draw a card. Activate only as a sorcery.

Flying, haste

When Swiftgear Drake enters the battlefield, put up to one target card from a graveyard on the bottom of its owners library.