When Dreadhorde Twins enters the battlefield, amass Zombies 2. (Put two +1/+1 counters on an Army you control. It's also a Zombie. If you don't control an Army, create a 0/0 black Zombie Army creature token first.)

Zombie tokens you control have trample.

When Maalfeld Twins dies, create two 2/2 black Zombie creature tokens.

You may exert Trueheart Twins as it attacks. (It won't untap during your next untap step.)

Whenever you exert a creature, creatures you control get +1/+0 until end of turn.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Reach

When Twinshot Sniper enters the battlefield, it deals 2 damage to any target.

Channel — , Discard Twinshot Sniper: It deals 2 damage to any target.