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'As an additional cost to cast this spell, pay X life.
All creatures get -X/-X until end of turn.
'Toxic 3 (Players dealt combat damage by this creature also get three poison counters.) When this creature enters, you may pay {1}{G}. If you do, proliferate. (Choose any number of...
'Toxic 2 (Players dealt combat damage by this creature also get two poison counters. A player with ten or more poison counters loses the game.) When this creature enters, you...
'Enchant creature
Enchanted creature gets +1/+0 for each Mountain you control.
'Flying
Whenever this creature attacks and isn't blocked, defending player gets a poison counter. (A player with ten or more poison counters loses the game.)
'Deathtouch
When this creature enters, another target creature you control gains deathtouch until end of turn.
'Avoidance — Whenever you cast a noncreature spell, exile up to one target nonland permanent you control, then return that card to the battlefield under its owner's control.
'You don't lose the game for having 0 or less life. As long as you have 0 or less life, all damage is dealt to you as though its source...
Whenever a nontoken artifact creature you control deals combat damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)
'Trample Toxic 1 (Players dealt combat damage by this creature also get a poison counter.) Whenever this creature deals combat damage to a player, proliferate. (Choose any number of permanents...
'Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) Whenever a creature you control with deathtouch deals combat damage to a player, that player...
'Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters.) Whenever this creature becomes blocked, it gets +2/+2...