Tatl, Umbral Echo

Partner with Leodithas, The Umbral Lion
Eminence-Whenever a Legendary Creature dies, if Tatl, Umbral Echo is in the command zone or on the battlefield, create a Black Gem token
Shroud
When Tatl, Umbral Echo enters the battlefield if you control X Black Gem token, where X is the number listed below, grant Leodithas, The Umbral Lion that boon and all previous boons
1-Reach
2-Ward {2}
3-Double Strike
4-Menace
5-Annihilator 2
When Tatl, Umbral Echo leaves the battlefield, sacrifice all Bl