Training Grounds

Activated abilities of creatures you control cost {2} less to activate. This effect can't reduce the mana in that cost to less than one mana.

Manaweft Sliver

Sliver creatures you control have "{T}: Add one mana of any color."

All Slivers have "{T}: Add one mana of any color."

{2}: Create a 1/1 colorless Sliver creature token.

Sliver creatures you control have flying and haste.

Activated abilities of creatures cost {1} less to activate. This effect can't reduce the mana in that cost to less than one mana.