Molten Echoes
{2}{R}{R}
Enchantment
As ~this~ enters, choose a creature type.
Whenever a nontoken creature you control of the chosen type enters, create a token that's a copy of that creature. That token gains haste. Exile it at the beginning of the next end step.
Nemesis Trap
{4}{B}{B}
Instant -- Trap
If a white creature is attacking, you may pay {B}{B} rather than pay ~this~'s mana cost.
Exile target attacking creature. Create a token that's a copy of that creature. Exile it at the beginning of the next end step.