Siren's Call [Alpha Edition] Ravnica "Know your foes' strengths as

"Know your foes' strengths as well as their weaknesses

Activate only if Glory is in your graveyard

"We have been patient

From the holy church to the sacred glade

if you have the city's blessing

Siren's Call [Alpha Edition] Ravnica "Know your foes' strengths asSet: Alpha Edition Type: Instant Rarity: Uncommon Cost: {U} Cast this spell only during an opponent's turn, before attackers are declared. Creatures the active player controls attack this turn if able. At the beginning of the next end step, destroy all non Wall creatures that player controls that didn't attack this turn. Ignore this effect for each creature the player didn't control continuously since the beginning of the turn.