So I was just double checking that Malignus holds its power and toughness in all zones letting amplifire set up for a one shot. Additionally I was wondering if there were any other suggestions.
Relevant rule
208.2. Some creature cards have power and/or toughness represented by a * instead of a number. The object has a characteristic-defining ability that sets its power and/or toughness according to some stated condition. This ability functions everywhere, even outside the game. If the ability needs to use a number that can't be determined, use 0 instead of that number.
In the future, this type of post should be in a different forum. Since you are asking for suggestions for a card in Commander (I am guessing that is what "[comm]" refers to), you would probably be better of just putting this in the Commander forum as you would like get more responses there.
As the rule you found states, Malignus's ability works in all zones. So, if you reveal it off Amplifire, and the highest life total among your opponents is 27 (for example), Amplifire will become 28/28 (27 / 2 = 13.5; rounded up is 14; 14 * 2 = 28).
Now, the interaction of Malignus with Grenzo is already unlikely to work since its P/T is generally going to be pretty high. The other issue is that you don't have control over the order the cards on the bottom of your library with Amplifire so there is no guarantee that the creature you reveal will be on the bottom of your library unless you only revealed 1 card.
As for suggestions, are you just looking for things that work in a Grenzo deck in general or things that work better with Amplifire?
So I saw this card amplifire and was thinking of a red elemental deck. Then I remembered that Grenzo, Dungeon Warden interacts nicely with this card and has black to search it up. I was thinking play amplifire either roll into Malignus or pull Flamekin Harbinger and then get it back with Grenzo, Dungeon Warden. additionally Soulbright Flamekin gives a trample outlet with a couple other red instants.
So I was just double checking that Malignus holds its power and toughness in all zones letting amplifire set up for a one shot. Additionally I was wondering if there were any other suggestions.
Relevant rule
208.2. Some creature cards have power and/or toughness represented by a * instead of a number. The object has a characteristic-defining ability that sets its power and/or toughness according to some stated condition. This ability functions everywhere, even outside the game. If the ability needs to use a number that can't be determined, use 0 instead of that number.
As the rule you found states, Malignus's ability works in all zones. So, if you reveal it off Amplifire, and the highest life total among your opponents is 27 (for example), Amplifire will become 28/28 (27 / 2 = 13.5; rounded up is 14; 14 * 2 = 28).
Now, the interaction of Malignus with Grenzo is already unlikely to work since its P/T is generally going to be pretty high. The other issue is that you don't have control over the order the cards on the bottom of your library with Amplifire so there is no guarantee that the creature you reveal will be on the bottom of your library unless you only revealed 1 card.
As for suggestions, are you just looking for things that work in a Grenzo deck in general or things that work better with Amplifire?