Moritte of the Frost | River Kelpie | Phyrexian Altar

Cards

All permanents on the battlefield (
Moritte of the Frost as a copy of
River Kelpie).

Activate
Phyrexian Altar by sacrificing
Moritte of the Frost, adding one mana of any color.
When
Moritte of the Frost dies, its persist ability triggers, returning it from your graveyard to the battlefield as a copy of
River Kelpie with two +1/+1 counters on it and one -1/-1 counter on it.
Remove one +1/+1 counter and one -1/-1 counter from
Moritte of the Frost as a state-based action.
When
Moritte of the Frost enters the battlefield, it and
River Kelpie's first ability triggers, causing you to draw two cards.
Repeat.