Marcus, Silly Genius

Marcus power and toughness are each equal to the
number of Islands you control.

Whenever Marcus enters or attacks, put a
flood counter on target land. It's an Island in
addition to its other types for as long as it has a
flood counter on it.

The first instant or sorcery spell you cast each turn
costs {u} (or {1}) less to cast for each land you
control with a flood counter on it.