Shore Keeper

{7}{U}, {T}, Sacrifice Shore Keeper: Draw three cards.

Scuttling Sliver

Sliver creatures you control have "{2}: Untap this creature."

Cryptic Trilobite

Cryptic Trilobite enters with X +1/+1 counters on it.
Remove a +1/+1 counter from Cryptic Trilobite: Add {C}{C}. Spend this mana only to activate abilities.
{1}, {T}: Put a +1/+1 counter on Cryptic Trilobite.

Electryte

Whenever Electryte deals combat damage to defending player, it deals damage equal to its power to each blocking creature.