pokemon xy primal clash booster box and Primal Groudon Opening 6 Pokemon Primal Clash

There are a few confusing things about this card, and well cover them all

Note: This is a custom commander deck, not apre-constructed product

This deck list that had a top finish at a major online tournament interestingly includes Grand tree a tech that I think was very wise

Horizon of Progress's first ability checks the effects of all mana-producing abilities of lands you control, but it doesn't check their costs or legality

If you don't cast the copy, it ceases to exist the next time state-based actions are checked

For example, playing this white human cleric into the next card means you can cast a 3-drop and then still end the turn with 1 energy