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You can and, if you attack, you MUST attack the player. In Magic, you always (with exceptions in planeswalkers and multiplayer games) attack the player. It is the defensive player who CHOOSE if he will block or not.

Let's say the opponent has 5 lives. It is your attack phase and you attack (in a 1vs1 game, you don't even choose who to attack, you just Attack the opponent player). He can decide to block your creature with his 1/1 flier (losing it and getting 3 damages himself) or just let the damage go through, getting the 4 damages and keeping his creature alive.

In the actual state of the game the trample MATTERS, because he will die because of the 3 trample damage points. Without trample, he could just block with the flier and stay alive in 2 lives.

You can and you MUST attack the player. In Magic, you always (with exceptions in planeswalkers and multiplayer games) attack the player. It is the defensive player who CHOOSE if he will block or not.

Let's say the opponent has 5 lives. It is your attack phase and you attack (in a 1vs1 game, you don't even choose who to attack, you just Attack the opponent player). He can decide to block your creature with his 1/1 flier (losing it and getting 3 damages himself) or just let the damage go through, getting the 4 damages and keeping his creature alive.

In the actual state of the game the trample MATTERS, because he will die because of the 3 trample damage points. Without trample, he could just block with the flier and stay alive in 2 lives.

You can and, if you attack, you MUST attack the player. In Magic, you always (with exceptions in planeswalkers and multiplayer games) attack the player. It is the defensive player who CHOOSE if he will block or not.

Let's say the opponent has 5 lives. It is your attack phase and you attack (in a 1vs1 game, you don't even choose who to attack, you just Attack the opponent player). He can decide to block your creature with his 1/1 flier (losing it and getting 3 damages himself) or just let the damage go through, getting the 4 damages and keeping his creature alive.

In the actual state of the game the trample MATTERS, because he will die because of the 3 trample damage points. Without trample, he could just block with the flier and stay alive in 2 lives.

1
source | link

You can and you MUST attack the player. In Magic, you always (with exceptions in planeswalkers and multiplayer games) attack the player. It is the defensive player who CHOOSE if he will block or not.

Let's say the opponent has 5 lives. It is your attack phase and you attack (in a 1vs1 game, you don't even choose who to attack, you just Attack the opponent player). He can decide to block your creature with his 1/1 flier (losing it and getting 3 damages himself) or just let the damage go through, getting the 4 damages and keeping his creature alive.

In the actual state of the game the trample MATTERS, because he will die because of the 3 trample damage points. Without trample, he could just block with the flier and stay alive in 2 lives.