Sol Ring

Spara's Headquarters

({T}: Add {G}, {W}, or {U}.)
Spara's Headquarters enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)

Search your library for a creature card, reveal it, then shuffle and put that card on top.

You have no maximum hand size.
{T}: Add {C}.

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

({G/P} can be paid with either {G} or 2 life.)
Put target card from a graveyard on top of its owner's library.

Search your library for a creature card, reveal it, then shuffle and put the card on top.

Seaside Citadel enters tapped.
{T}: Add {G}, {W}, or {U}.