Seafloor Debris

Seafloor Debris enters tapped.
: Add .
, Sacrifice Seafloor Debris: Add one mana of any color.

Mystic Penitent

Vigilance
Threshold — As long as seven or more cards are in your graveyard, Mystic Penitent gets +1/+1 and has flying.

Seafloor Debris

Seafloor Debris enters tapped.
: Add .
, Sacrifice Seafloor Debris: Add one mana of any color.

Childhood Horror

Flying
Threshold — As long as seven or more cards are in your graveyard, Childhood Horror gets +2/+2 and can’t block.

Lure

Enchant creature
All creatures able to block enchanted creature do so.

Mana Clash

You and target opponent each flip a coin. Mana Clash deals 1 damage to each player whose coin comes up tails. Repeat this process until both players’ coins come up heads on the same flip.