In Tobin (2004), pp
Yes, your opponent had to spend a card and mana to do that, but if a card was printed that said "if this card is in your opening hand, you can reveal it Leyline style to force your opponent to mulligan after he/she is done resolving mulligans," it would see some play simply because of the free wins
Also, enemy colored dragonlords
With new leader cards, flashy effects, and fan-favorite characters returning in fresh colors and with unique traits, this set is designed to deliver strategic depth and electrifying gameplay for both seasoned players and ambitious newcomers
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it's simply a strategic decision that's part of the game