If X is 5 or more, return a creature card with mana value X or less from your graveyard to the battlefield tapped
Like many War Of The Spark planeswalkers, Teferi, Time Raveler has a static ability that prevents opponents from casting any spells at instant speed, meaning they can only play them during their own turn
The only disadvantage with Resplendent Angel is that it's going to get targeted for removal
Kathril abuses these counters to make itself huge, and the only thing you need to do is get as many creatures with different static abilities in your graveyard
The rest of the deck is a specially crafted arsenal of creatures, artifacts, and other spells, designed to reflect the personality of that commander and take advantage of his or her strengths
Cheap key cards: Goblin Warchief, Skirk Prospector, Impact Tremors, Goblin Chieftain, Krenkos Command, Shamanic Revelation