Reliquary Tower

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

Kozilek, the Great Distortion

When you cast this spell, if you have fewer than seven cards in hand, draw cards equal to the difference.
Menace
Discard a card with mana value X: Counter target spell with mana value X.

Expedition Map

{2}, {T}, Sacrifice this artifact: Search your library for a land card, reveal it, put it into your hand, then shuffle.

Thought Vessel

Doubling Cube

{3}, {T}: Double the amount of each type of unspent mana you have.

Sol Ring

Jeweled Lotus

{T}, Sacrifice Jeweled Lotus: Add three mana of any one color. Spend this mana only to cast your commander.

Ashnod's Altar

All Is Dust

Each player sacrifices all permanents they control that are one or more colors.