Vortoss Emblem

Vortoss Emblem
Ongoing Spell
Fading 3
Attach to a unit. That unit is a flagbearer.
Whenever an opponent plays a spell or ability that can ◎ a flagbearer, it must ◎ a flagbearer at least once.
PurplePast Magic

Card-Specific Rulings
You can attach this to an enemy unit. If you do, you still control Vortoss Emblem itself, so the time runes on it still count toward your Temporal Research. — Sirlin
Fading X Rulings
If you remove the last time rune for some other reason than the fading ability, such as from Time Spiral, Seer, or Tinkerer, you still must sacrifice the fading thing. — Sirlin
If you somehow have something with fading in play with 0 time runes (probably because you made a copy of something if fading), it won't die from fading anymore. — sharpo
X is not a limit to the number of time runes you can have on that card. For example, you can play Shimmer Ray and discard 4 cards so that it has 6 time runes; you're not limited to 2 total. — Sirlin
Flagbearer Rulings
Only spells and abilities that use the [target] symbol interact with a flagbearer. For example, Manufactured Truth does NOT have the [target] symbol, so it can copy a unit other than a flagbearer even if the opponent has a flagbearer. — Sirlin
This has nothing to do with attacking. The flagbearer effect only interacts with spells and abilities that use the [target] symbol, not with declaring attacks. You don't have to attack a flagbearer before you attack other things. — Sirlin
If you cannot target a flagbearer for some reason, then you don't have to and you can ignore it. For example, if a flagbearer has resist 1 (which requires you to pay 1 gold to target it) and you have 0 gold, you don't have to target it. Or in other words, if you have a spell that costs 4 and that targets, and you have exactly 4 gold, you CAN ignore a flagbearer with resist 1 because it's impossible for you to pay the resist cost in this case, and thus impossible to target the flagbearer. — Sirlin
If a spell can target multiple things, such as Ember Sparks, and it can target a flagbearer, it only needs to target that flagbearer once. For example, you might split Ember Sparks to do 1 damage to a Frog, 1 damage to a Skeleton, and 1 damage to a Flagbearer. That's legal and still obeys the flagbearer's effect. — Sirlin