extra turn mtg cards Temporal Mastery - Modern Masters 2017 Edition #54 (English) Why is it so common

It can serve as a potent win condition, capable of delivering substantial damage to opponents and planeswalkers alike

I was honestly a little surprised to see any infinite combos in these decks out of the box, even if it isn't a two-card combo

Its cheap, repeatable, and instant speed

However, a defender creature can block as normal

Umbra armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.) Lion Umbra can't become attached to a creature unless that creature is already modified

Crucially, their selection of instant effects is very limited, so they arent as able to hold up mana to defend themselves