mtg card database app program A Fresh Look for Gatherer MTG Search (scan deck-builder) -

It's incredibly deep

For example, I can tap [c]Dawnhart Rejuvenator[/c] to add one mana of any color, except the turn that it entered the battlefield

Firstly, its not an enchantment, so its not going to die to Mortify or Knight of Autumn or the multitude of other disenchant effects in Standard right now, all of which are going to see plenty of play with so many juicy targets for them, like Wilderness Reclamation and Experimental Frenzy

Saheeli, the Gifted can be your commander

Creature - Unicorn Color tag templates(None) Lathiel, the Bounteous Dawn Lifelink At the beginning of each end step, if you gained life this turn, distribute up to that many +1/+1 counters among any number of other target creatures