Chief: It is worth mentioning that if you target a spell that becomes a permanent when it resolves, the effect of this spell will continue to apply to that permanent for the rest of the turn
Imagine having 4 Mana on turn 4, you can cast 2 1-cost Creatures, both triggering Mentor
However, as the ability resolves during the end phase, neither Summons nor abilities can then be used to facilitate this
Obvious deck home aside, I do think it can do work elsewhere in the newer Aura-enchantress R/x decks, and Feather, for instance
The borderless full-art cards originally came out for a Wizards of the Coast-organized program called Champs, run in the various U.S
This deck was so poorly built that it got a rare F grade from me